1 . Plant biologists have found a way that may enable poor farmers to do away with the need to purchase expensive hybrid seeds every year. Researchers at the University of California report that they have solved a long-standing problem of hybrid seeds by making exact clones of the hybrid plants from seeds.
For long, many crops have been grown from high-yielding, anti-disease or climate-tolerant hybrid seeds. But the seeds of hybrid crops do not produce plants with the same qualities during reproduction and hence farmers cannot save the seeds for the next growing season. They end up paying for new hybrid seeds each sowing season. The discovery, long sought by plant researchers, could make it easier to grow desirable high-yielding crops and make them available to the world’s farmers. Farmers could thus replant seeds from their own hybrid plants and enjoy the benefits of high production year after year, the scientists report.
While the discovery would help farmers, it would also impact the commercial interest of the hybrid seed industry. Siddiq, a former Deputy Director General in the Crop Science Division of the ICAR, said at first sight, this might seem like a setback for hybrid seed companies but there would be plenty of things they can still do. “Rice is grown over such a vast climatic and geographical range that specialized hybrids would have to be developed for each region,” he said. The companies, he said, would continue to improve their hybrids. “It will be interesting to see how all this plays out in the years to come.”
Currently, the high costs of producing hybrid seeds are a major barrier to farmers in developing countries, especially South Asia and Africa. Siddiq said if efficiently used, this method could potentially be a game-changer for poor farmers, who would need to purchase hybrid seeds just once and plant the progeny(后代) seeds from their own harvest in the following seasons.
1. What problem do the researchers aim to solve?| A．Farmers’ income. | B．Farmers’ costs. |
| C．Hybrid seeds’ cloning. | D．Hybrid seeds’ climate tolerance. |
| A．They have a pretty long growth cycle. |
| B．They tend to be affected by various diseases. |
| C．They have stricter requirements for sowing time. |
| D．They fail to reproduce plants with the same quality. |
| A．Hopeful. | B．Concerned. | C．Doubtful. | D．Anxious. |
| A．The future of the hybrid seed industry. |
| B．The drawback of cloning hybrid seeds. |
| C．A method of cloning hybrid plants from their seeds. |
| D．A means of promoting the specialized hybrid seeds. |
1. What is the most important thing when planning a garden?
| A．Growing what one loves. |
| B．Picking the right soil. |
| C．Choosing the location of the garden. |
| A．5. | B．4. | C．3. |
| A．They’re less expensive. |
| B．They grow more easily. |
| C．Their fruits will grow big enough. |
| A．Plant right before the growing season. |
| B．Ask an expert for the right soil. |
| C．Enjoy the process of planting. |
3 . When scientists talk about recent extinctions, birds and mammals (哺乳动物) get most of the attention. But the first global analysis of its kind finds it is twice as many plants that have disappeared as birds, mammals, and amphibians (两栖动物) combined.
Researchers reviewed published research, international databases, and museum specimens such as grasses from Madagascar, finding that 571 plants species have gone extinct in the past 250 years. One reason why the total is higher than that of the well-studied animals is that there are simply more species of plants. Looking at percentages, the situation is worse for mammals and birds. An estimated 5% of those species have gone extinct, compared with 0.2% of plants.
The loss includes the Chile sandalwood tree in the South Pacific, which was cut down for its fragrant (芳香的) wood. It was last seen on Robinson Crusoe Island in 1908. The extinction rates among plants have been highest for trees and shrubs on islands, which often have species that occur nowhere else, and in regions with rich diversity, especially the tropics and in Mediterranean climates.
Just a few years later, the world lost the banded Trinity (Thismia americana), a leafless plant that grew entirely underground except for its flowers. Most species of this kind of plant grow in rainforests, but this plant was first described in 1912 in a sandy wetland in Chicago, Illinois, and was wiped out by development.
According to the team’s report in Nature Ecology & Evolution, the total of 571 extinct plant species is four times higher than the official listing kept by the International Union for Conservation of Nature. Even so, it is probably still an underestimate (低估), as less is known about the status of plants in Africa and South America than on other continents. Many of these species may disappear, too. A major review of the status of global biodiversity recently estimated that more than a million species, including 14% of plant and animal diversity, are threatened with extinction.
1. What caused the extinction of the Chile sandalwood tree?| A．Climate change. | B．The market demand. |
| C．Environmental pollution. | D．The decline of the habitat. |
| A．It flowered without bearing seeds. |
| B．It disappeared during the 19th century. |
| C．It was a flowering plant without leaves. |
| D．It was a rare plant growing underground. |
| A．Their current situation is more worrying. |
| B．About one plant species dies out every year. |
| C．More plant species will keep alive in the reserve. |
| D．They would be replaced by other new species soon. |
| A．Sports. | B．Nature. | C．Entertainment. | D．Figures. |
The record of the
The record-breaking high tree, called Cupressus torulosa(西藏柏木),
Mainly distributed in southeastern Tibet, Cupressus, torulosa has a narrow distribution area and
The previous China tree height record
5 . How to create an indoor garden
If you’re looking for a way to brighten up your home, consider creating an indoor garden.
Deciding is probably the hardest part when it comes to creating an indoor garden because there are just so many plants to choose from. Start by thinking about what type of plants you want.
Now that you know what type of plants you want, it’s time to get the right potting soil and containers. Make sure to get a potting mix that is specifically designed for indoor plants.
Choose a bright location Once you have your plants and pots, it’s time to choose a location for your indoor garden.
In addition to watering, you’ll also need to add substance to your plants about once a month. This will help them grow and stay healthy. Just be sure to follow the instructions on the package. Don’t overdo it.
| A．Give fertiliser monthly. |
| B．How exactly can we make one? |
| C．Follow the instruction correctly. |
| D．But don’t worry, we’re here to help. |
| E．This will help your plants grow strong. |
| F．Do you want something that will blossom? |
| G．Look for a spot in your home that gets a lot of natural light. |
6 . What if someone told you about a kind of grass as tall as the tallest trees? A grass as strong as steel? Would you believe that person? You should, for that grass is bamboo (竹子), which has more than 1,000 uses. It is not just a material for making useful products. Young bamboo is eaten, often mixed with other vegetables.
Bamboo grows in many parts of the world. In the USA it grows in many states like Virginia and Florida. Most bamboo, however, is found in wet and warm climates, especially in Asia and on the islands of the South Pacific Ocean.
In most Asian countries, bamboo is nearly as important as rice. This unusual material is used to not only build large buildings but also make water pipes, musical instruments and paper. There are over 1,000 kinds of bamboo. No wonder the lives of nearly half the people on earth would change greatly if there were no longer any bamboo.
1. According to the text, bamboo is actually a kind of .| A．grass | B．steel | C．tree | D．vegetable |
| A．Only in Asia. | B．Only in the USA. |
| C．In wet and warm climates. | D．All over the world. |
| A．Build large buildings. | B．Make water pipes. |
| C．Make musical instruments and paper. | D．All of the above. |
| A．Over 1,000. | B．Over 800. | C．Over 600. | D．Over 400. |
7 . Growing flowers is not as difficult as it might seem at first glance.
The third step is to drill a small hole in a potato.
The final step is to cut out the bottom of the plastic bottle and then place it around the rose.
| A．It should be just the size of the rose. |
| B．You really don’t need to be a gardening professional. |
| C．First of all, you need to choose a rose you really like. |
| D．There is a simple trick that can be used to help roses grow. |
| E．Once you, have prepared the soil, place the rose in the potato. |
| F．Flowers are expensive, so why not grow them in your own garden? |
| G．Now all you need to do is water the soil occasionally and have some patience. |
8 . With no special equipment, no fences and no watering, two abandoned agricultural fields in the UK have been rewilded (重新野化), in large part due to the efforts of jays, which actually “engineered” these new woodlands. Researchers now hope that rewilding projects can take a more natural and hands-off approach and that jays can shed some of their bad reputations.
The two fields, which researchers have called the New Wilderness and the Old Wilderness, had been abandoned in 1996 and 1961 respectively. The former was a bare field, while the latter was grassland—both lay next to ancient woodlands. Researchers had suspected that the fields would gradually return to wilderness, but it was impressive to see just how quickly this happened, and how much of it was owed to birds.
Using aerial data, the researchers monitored the two sites. After just 24 years, the New Wilderness had grown into a young, healthy wood with 132 live trees per hectare, over half of which (57%) were oaks. Meanwhile, the Old Wilderness resembled a mature woodland after 39 years, with 390 trees per hectare.
“This native woodland restoration was approaching the structure (but not the species composition) of long-established woodlands within six decades,” the researchers explained in the study.
Part of this reforestation was done by the wind, and researchers suspect that previous ground disturbance may have aided the woodland establishment—which is good news, as it would suggest that agricultural areas may be reforested faster than anticipated. However, animals—Eurasian jays, thrushes, wood mice, and squirrels—also played an important role in helping the forests take shape. This handful of species provided much of the natural regeneration needed for the forest to develop. Jays, in particular, seem to have done a lot of heavy lifting.
1. What does the underlined word “shed” in Paragraph 1 refer to?| A．Be opposed to. |
| B．Be ashamed of. |
| C．Get used to. |
| D．Get rid of. |
| A．The scale of the woodlands. |
| B．The diversity of the fields. |
| C．The rate of the changes. |
| D．The frequency of the wilderness. |
| A．The woodland restoration was approaching the structure of long-established ones. |
| B．Much of the wilderness of the fields was owed to birds. |
| C．Previous ground disturbance aided the woodland establishment. |
| D．How quickly the fields returned to wilderness over time. |
| A．The essential role of humans in the reforestation. |
| B．The factors that contribute to the reforestation. |
| C．The importance of woodland establishment. |
| D．The threats faced by a handful of wild animals. |
9 . A few weeks ago, I received a package containing a small batch (一批) of seeds from my friend. When I asked her what it would grow
I sowed the seeds in a beautiful flowerpot. In the first few days, I was excited to search for the slightest
I watered the plant carefully. I placed the plant in the sunlight and rotated (旋转) it for a
Bending down and carefully studying the seedlings, I could almost
Now they are taller than the edge of the pot,
I am certain that after a few more days, my coriander plants will be ready for
| A．into | B．for | C．up | D．out |
| A．gradually | B．incredibly | C．ultimately | D．intently |
| A．samples | B．signs | C．routes | D．proofs |
| A．apparent | B．distinct | C．conventional | D．massive |
| A．allowed for | B．longed for | C．provided for | D．went for |
| A．intense | B．violent | C．balanced | D．exceptional |
| A．emerged | B．hatched | C．reserved | D．sank |
| A．pray | B．assess | C．forecast | D．hear |
| A．conflicted | B．facilitated | C．crowded | D．surrounded |
| A．subsequently | B．constantly | C．extensively | D．merely |
| A．howl | B．scream | C．thunder | D．whisper |
| A．initiative | B．leisure | C．harmony | D．luxury |
| A．possession | B．consumption | C．exposure | D．harvest |
| A．breaking into | B．relating to | C．brightening up | D．wearing down |
| A．touch | B．bunch | C．host | D．lot |
10 . For many people, catching a smell of freshly cut grass is a pleasant sign that warmer weather is here to stay. For the grass, however, this scent signals an entirely different story.
The smell we associate with freshly cut grass is actually a chemical SOS, one used by plants to beg nearby creatures to save them from attack. After all, when danger strikes —whether it's gardening equipment or a hungry caterpillar — plants can't lift their roots and run. They must fight where they stand. To protect themselves, plants employ a string of molecular (分子) responses. These chemical communications can be used to poison an enemy, warn surrounding plants of dangers or attract helpful insects to perform needed services.
Clearly, plants can communicate. But does that mean they can feel pain? According to some researchers, plants release gases that are the equivalent of crying out in pain. Using a laser-powered microphone, researchers have picked up sound waves produced by plants releasing gases when cut or injured. Although not audible to the human ear, the secret voices of plants have revealed that cucumbers scream when they are sick, and flowers cry when their leaves are cut.
There's also evidence that plants can hear themselves being eaten. Researches show that plants understand and respond to chewing sounds made by caterpillars dining on them. As soon as the plants hear the noises, they respond with several defense mechanisms.
For some researchers, evidence of these complex communication systems — giving out noises via gas when in pain — signals that plants feel pain. Others argue that there cannot be pain without a brain to register the feeling. Still more scientists infer that plants can exhibit intelligent behavior without possessing a brain or conscious awareness.
As they grow, plants can change their paths to avoid obstacles or reach for support with their tendrils (卷须). This activity comes from a complex biological network distributed through the plants' roots, leaves and stems. This network helps plants reproduce, grow and survive.
1. What does the smell of freshly cut grass signal?| A．Warmer weather. | B．Being poisonous. |
| C．Cry for help. | D．The need of services. |
| A．By giving out gases. | B．By changing the color of their leaves. |
| C．By producing audible sound waves. | D．By sharing it through the root systems. |
| A．Their tendrils. | B．Their biological network. |
| C．Their communication systems. | D．Their conscious awareness. |
| A．Do plants feel pain? | B．How plants protect themselves? |
| C．Do plants communicate? | D．How plants grow and reproduce? |
