1 . Scientists have been experimenting with playing sounds to plants since at least the 1960s, during which time they have been exposed to everything from Beethoven to Michael Jackson. Over the years, evidence that this sort of thing can have an effect has been growing. One paper, published in 2018, claimed that an Asian shrub known as the telegraph plant grew substantially larger leaves when exposed to 56 days of Buddhist music — but not if it was exposed to Western pop music or silence. Another, published last year, found that marigolds and sage plants exposed to the noise of traffic from a busy motorway suffered growth difficulty.
Plants have been evolving (进化) alongside the insects that eat them for hundreds of millions of years. With that in mind, Heidi Appel, a botanist now at the University of Houston, and Reginald Cocroft, a biologist at the University of Missouri, wondered if plants might be sensitive to the sounds made by the animals with which they most often interact. They recorded the vibrations made by certain species of caterpillars (毛毛虫) as they chewed on leaves. These vibrations are not powerful enough to produce sound waves in the air. But they are able to travel across leaves and branches, and even to neighbouring plants if their leaves touch.
They then exposed tobacco plant — the plant biologist’s version of the laboratory mouse — to the recorded vibrations while no caterpillars were actually present. Later, they put real caterpillars on the plants to see if exposure had led them to prepare for an insect attack. The results were striking. Leaves that had been exposed had significantly higher levels of defensive chemicals, making them much harder for the caterpillars to eat. Leaves that had not been exposed to vibrations showed no such response. Other sorts of vibration — caused by the wind, for instance, or other insects that do not eat leaves — had no effect.
“Now speakers with the right audio files are more often being used to warn crops to act when insects are detected but not yet widespread,” says Dr. Cocroft. “Unlike chemical pesticides, sound waves leave no dangerous chemicals.”
1. What can we learn about plants from the first paragraph?A.They may enjoy Western music. | B.They can’t stand Buddhist music. |
C.They can react to different sounds. | D.They can make different sounds. |
A.Plants can make a cry for help. | B.Plants evolve alongside insects. |
C.Plants are sensitive to the sounds. | D.Plants have been studied for years. |
A.They can recongnize harmful vibrations. | B.They look like laboratory mice. |
C.They can threaten the caterpillars. | D.They can release poisonous chemicals. |
A.Disadvantages of chemical pesticides. | B.Application of the experimental results. |
C.Interaction between plants and insects. | D.Warning system of widespread insects. |
2 . At first, the grains of rice that Ingo Potrykus held in his fingers did not seem at all
For more than a decade Potrykus had
At that point, he tackled an even greater challenge. The golden grains
The debate began the moment genetically engineered crops (GM crops) were first sold in the 1990s, and it has
The hostility is
The benefits did seem small
Many people
A.typical | B.special | C.local | D.white |
A.dreamed of | B.come in handy | C.been reminded of | D.broken up |
A.attempt at | B.effort to | C.resistance to | D.majority of |
A.But | B.And | C.While | D.Since |
A.surprise | B.obstacle | C.norm | D.opposition |
A.achieved | B.stressed | C.overlooked | D.contained |
A.was caught in | B.was alive with | C.be conscious of | D.was honored by |
A.announced | B.maintained | C.escalated | D.applied |
A.brilliant | B.understandable | C.discharged | D.rewarding |
A.introduced | B.reminded | C.respected | D.overlooked |
A.toss and turn | B.give and take | C.produce and sell | D.demand and supply |
A.until | B.after | C.although | D.when |
A.feature | B.mark | C.build | D.benefit |
A.worried about | B.ashamed of | C.filled with | D.admired for |
A.terror | B.misery | C.starvation | D.crisis |
With high yield and superior quality, Chinese hybrid rice varieties have been introduced around the world,
In the past 40 years, Chinese scientists
Yuan Longping,
It
4 . Farmers in Italy’s famous Tuscany area are struggling to save grape and olive crops influenced by a heatwave and dry conditions. A lack of (缺乏) rainfall since spring has even influenced plants that traditionally grow well in hot and dry weather.
In San Casciano in Val di Pesa, near Florence, olive trees line the hillsides. But farmers say the dry soil is preventing the trees from producing the usual production of fruit.
Tuscany is famous around the world for its olive oil and wine from grapes. But growers in the area say dry, hot weather always has a great influence on the crops and harms (损害) production. But this year’s heat and lack of water happened during an important time, when the flowers were changing to fruit. Without water, many flowers fall to the ground before they can produce fruit. This year’s oil production could be cut by up to 60 percent.
Olive growers have decided to change some of their farming methods. They have used a new watering method to make up for the lack of rainfall and hot temperatures. The method works with a pipe placed under the trees to drop water little by little.
The influences of weather change have harmed production and plants, but they have also created new areas in Italy where crops can be grown. A few years ago, olive farms were mainly found in hot and dry areas such as Sicily. Now, areas such as Val d’Aosta in the far north of Italy — which is famous for its snow sport holiday places and mountains — can produce their own oil.
Climate change is also influencing wine crops in Tuscany. In Chianti, for example, September is normally the month for the yearly grape harvest (收获). But with continued high temperatures, many grapes are ripening(成熟) earlier than expected. Apart from the drop in grapes caused by the current heatwave, wine growers also have to deal with other serious weather events. An ice storm recently harmed 40 percent of grapes in the area.
1. What was the reason for the drop in oil production this year?A.The dry weather lasted a longer time. |
B.The fruit dropped to the ground before harvest. |
C.The dry weather happened in a special period. |
D.It was uncommon for the crops to experience dry weather. |
A.It increases the planting areas of crops. |
B.It encourages better farming methods. |
C.It improves the taste of crops. |
D.It attracts more tourists to the area. |
A.The influences of poor grapes on red wine. |
B.The harm brought by an ice storm to grapes. |
C.The production of grapes dropped because of dry weather. |
D.The influences of bad weather on grapes. |
A.Farmers in Italy Are Expecting Some Rain |
B.Dry Weather Influences Italy’s Famous Grape & Olive Crops |
C.More Areas in Italy Are Fit for Crops Because of Warming Climate |
D.New Ways Are Introduced to Fight Against Dry Weather |
5 . How to Prepare Houseplants for Fall
It would be easy to think that since houseplants live inside, they don't really experience seasons as their outdoor plants do.
Remove any dead or dying leaves. Find any yellowing or brown leaves.
Be mindful of extreme temperatures. Hot or cold extremes can stress(使……紧张)plants out.
Repot(移植)if needed. Spring is the best time to repot houseplants because that's when they begin to grow rapidly. But if any of your babies have had an active summer and are too small for their pot, now is a good time as well. Lift the plant out of the pot and check how the roots look.
Be careful with watering. Over-watering is one of the most common houseplant mistakes. Unless you have especially thirsty species or a very dry home, wait at least a few days in between watering.
A.The plants under stress will die soon. |
B.If they seem crowded, it is time to repot. |
C.So be careful about where your plants are living. |
D.Bring them in if they've been vacationing outside. |
E.Pay attention to whether there are harmful insects. |
F.It's true that they are provided more protection inside. |
G.Cut off the leaves of these colors at the base or at the soil. |