1 . Common water plant could provide a green energy source. Scientists have figured out how to get large amounts of oil from duckweed, one of nature’s fastest-growing water plants. Transferring such plant oil into biodiesel (生物柴油) for transportation and heating could be a big part of a more sustainable future.
For a new study, researchers genetically engineered duckweed plants to produce seven times more oil per acre than soybeans. John Shanklin, a biochemist says further research could double the engineered duckweed’s oil output in the next few years.
Unlike fossil fuels, which form underground, biofuels can be refreshed faster than they are used. Fuels made from new and used vegetable oils, animal fat and seaweed can have a lower carbon footprint than fossil fuels do, but there has been a recent negative view against them. This is partly because so many crops now go into energy production rather than food; biofuels take up more than 100 million acres of the world’s agricultural land.
Duckweed, common on every continent but Antarctica, is among the world’s most productive plants, and the researchers suggest it could be a game-changing renewable energy source for three key reasons. First, it grows readily in water, so it wouldn’t compete with food crops for agricultural land. Second, duckweed can grow fast in agricultural pollution released into the water. Third, Shanklin and his team found a way to avoid a major biotechnological barrier: For the new study, Shanklin says, the researchers added an oil-producing gene, “turning it on like a light switch”by introducing a particular molecule (分子) only when the plant had finished growing. Shanklin says, “If it replicates (复制) in other species-and there’s no reason to think that it would not — this can solve one of our biggest issues, which is how we can make more oil in more plants without negatively affecting growth.”
To expand production to industrial levels, scientists will need to design and produce large-scale bases for growing engineered plants and obtaining oil — a challenge, Shanklin says, because duckweed is a non-mainstream crop without much existing infrastructure (基础设施).
1. What can people get from duckweed firsthand?| A．Plant oil. | B．Stable biodiesel. |
| C．Sustainable water. | D．Natural heat. |
| A．Options for renewable energy. |
| B．Reasons for engineering genes. |
| C．The potential of revolutionary energy source. |
| D．The approach to avoiding agricultural pollution. |
| A．Industrial levels. | B．Unique design. |
| C．Academic research. | D．Basic facilities. |
| A．Duckweed Power | B．Duckweed Production |
| C．Genetic Engineering | D．Genetic Testing |
2 . You’ll only find cherry blossoms in a handful of countries.
Called sakura in Japan, the cherry blossoms of Yoshino and Kyoto are world-famous. Tourists flock to the country each spring to try their hand at a centuries-old activity “flower viewing”. You don’t have to fly to Japan to see them, though. In the US, the cherry blossoms of Washington, D.C., New York City, Philadelphia, St. Louis, Seattle, San Francisco, and Boston are all beautiful in their own way. The flowers can also be viewed in many European and Asian countries, as well as Brazil and Australia in the southern hemisphere.
There are hundreds of cherry tree varieties.
Japan in particular is home to hundreds of types of cherry trees -possibly more than 600.Some types bear fruit, while others don’t. The flowers of many trees change from dark pink to light pink to white throughout the different stages of blossoming, while others progress from greenish yellow to white to pink. One variety, called Kanzan, was bred to have “double blossoms” — or up to28 petals (花瓣) on each flower, compared to the Yoshino tree’s five petals.
You can get arrested for picking a cherry blossom in Washington, D. C.
Resist the urge to take a cherry blossom home with you as a souvenir. In D.C. at least, breaking off a blossom or branch is viewed as destruction of federal property. Those who break this rule could receive a citation (传票), or worse, be arrested. It goes without saying that it’s also illegal to climb the trees. If they sustain damage to their branches, they will never be able to grow new blossom on that particular branch again.
Both the blossoms and leaves are edible.
In Japan, no part of the cherry blossom tree pes to waste. The preserved leaves are used as edible mochi wrappers (a rice cake filled with sweet bean paste), and a number of seasonal snacks feature sakura as a key ingredient Sakura-flavored versions of Pepsi, Coke, tea, and even Starbucks lattes are all popular drinks. You can also find Kit Kats and Pocky snack sticks that taste like sakura.
They were the inspiration behind a record-setting LEGO sculpture.
Legoland Japan, a theme park in Nagoya, set a Guinness World Record in 2018 for the largest LEGO brick cherry blossom tree ever made. The trees stood 14 feet tall, weighed over 7000 pounds, and consisted of more than 800,000 LEGO bricks.
1. In which country can’t you see cherry blossoms according to the passage?| A．America. | B．China. | C．Germany. | D．Egypt |
| A．Climbing cherry trees is tolerable in Washington. | B．Sakura-flavored snacks and drinks are welcomed. |
| C．Kanzan sakura is better than Yoshino sakura. | D．The largest cherry blossom tree grows in Japan. |
| A．A passionate environmentalist. | B．An ecological researcher. |
| C．A student interested in plants. | D．A tourist in Japan |
3 . Looking for a big-leafed houseplant that will make a statement in your room and decorate yourhome? If so, then you’ve come to the right place!
Peace Lily
Extremely easy to look after, this popular, flowering plant is very tolerant and undemanding. It is a beloved houseplant for its large, glossy oval leaves and unusual white spoon-shaped flowers. Typically blooming in the spring, this lovely plant can effectively brighten up a living space.
African Mask Plant
This indoor plant is a smaller plant with large dark green leaves that are shaped like a heart. Native to tropical (热带的) parts of Africa, it prefers high heat and high humidity. That can be somewhat a tricky task for the average plant owner to achieve in their home, who is likely to have trouble duplicating (复制) these steamy conditions.
Snake plant
Commonly referred to as mother-in-law’s tongue, it is one of the easiest houseplants to take care of. With tall, twisting sword-shaped leaves that grow upright, it has air-purifying capabilities and can merrily grow in almost dark corners of the house. But the plant is poisonous to dogs and cats, so it’s wise to keep this plant away from them, if your pets are plant chewers.
Kentia Palm
Caring for the Kentia Palm plant is very straightforward, which can be neglected for weeks at a time. Quite enjoying a bit of shade, it has big leaves that grow from a narrow base and is great for filling a corner without taking up much floor-space. Place it in front of a blank wall, and its archingfronds (大型复叶) will cast beautiful shadows.
1. Which of the following requires an experienced plant owner?| A．Peace Lily. |
| B．African Mask Plant. |
| C．Snake plant. |
| D．Kentia Palm. |
| A．It poses little danger to dogs and cats. |
| B．It is better for purifying air than others. |
| C．It gets its name from a poisonous snake. |
| D．It grows well in shady areas of the house. |
| A．Distinctive leaves. |
| B．Flowering season. |
| C．Growth temperature. |
| D．Striking size. |
4 . Healthy House Plants: A Complete Gulde to Gardening Indoors
BBC Gardeners’ World Magazine has collaborated (合作) with digital educational platform, FutureLearn, to bring you a brand new online gardening course — Healthy House Plants: A Complete Guide to Gardening Indoors. This four-week online course has been designed to provide you with tips and advice on growing indoor plants and take you on a world journey, exploring imported plants.
Your course instructor
The course is led by expert tutor and Associate Editor, David Hurrion, who will share his 50 years of gardening experience and bring his skills to you online, so you can learn from him in the comfort of your own home.
Learning on this course
You can take this self-guided course. On every step of the course you can meet other learners, share your ideas and join in with active discussions in the comments.
What’s covered in this course?
Week 1: What will you grow?
Week 2: Growing conditions and the indoor environment.
Week 3: Caring for your house plants.
Week 4: Making more plants and problem-solving.
Course registration (注册) and cost
There are three options for registering for this course：
*FREE — Access to the course is limited to six weeks, and no certificate (证书) is given.
*Upgrade for £32, unlimited time access, and a printed and digital certificate.
*Unlimited access to all FutureLearn short courses: £16.68/month.
More online courses with FutureLearn
Gardening for Beginners: The Basics and Beyond: Grow your gardening skills with easy-to-follow techniques aimed at both new and experienced home gardeners in this five-week online course.
1. What can the learners of this four-week course do?| A．Learn at their own pace. | B．Receive personalized guidance. |
| C．Attend more online courses for free. | D．Hand in a composition online. |
| A．Week 1. | B．Week 2. | C．Week 3. | D．Week 4. |
| A．£16.68. | B．£32. | C．£33.36. | D．£48.68. |
