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题型:阅读理解-阅读单选 难度:0.65 引用次数:38 题号:11237510

The baobab tree is sometimes called “the Tree of Life." Baobabs grow in Africa and Australia. They are the most famous trees in Africa. Baobabs have very thick, wide trunks (树干).Often the trunks have large empty spaces inside.

In South Africa, one famous tree had a hole so large that someone built a bar inside it. People could sit inside and order drinks. That tree was known as the Sunland Baobab. It was more than 1,000 years old. It was the biggest baobab in Africa. But in 2017 it fell down. In 2016, another famous baobab fell down and died. It was called the Chapman tree in Botswana.

A recent study shows that the problem is widespread. Adrian Patrut and his team started studying the baobabs in 2005.The team found bad news. In the past 12 years, “nine of the thirteen oldest and five of the six largest have died,” the report found. Sometimes parts of the tree didn't die. But the “oldest parts” did.

Experts aren't sure what is causing the baobabs to die. They think it may be related to climate change. But more research is needed to prove it.

The largest trees need more water and food than smaller baobabs. Patrut thinks that is what puts them at greater danger. More heat and less rainfall could have a big influence on the trees.

In Zimbabwe a fungus(真菌)turns baobabs black before they die. But Patrut's study didn't find signs of a widespread disease. No matter the cause, the loss is huge.

Baobabs are amazing. They are a major food source for people. The trees grow white flowers that open at night. Bats spread the pollen(花粉)and help the trees grow fruit. Their white fruit is called monkey bread. People use it as food and to make cool drinks. People make paper, cloth, and even drugs from baobab bark(树皮).

1. What do we know about the Sunland Baobab?
A.It was the biggest baobab in Australia.
B.It was the oldest tree in the world.
C.It fell down in 2016 in Botswana.
D.It once had a bar inside it
2. What did Patrut's study find?
A.More baobabs are dying,
B.Old baobabs are going to disappear.
C.Trees worldwide have common problems.
D.Trees' living environment is getting worse.
3. As for what's killing baobabs, experts ______
A.are certain human activities put them in danger
B.are sure it is because of climate change
C.have proved disease is the main cause
D.need to carry out more studies
4. What is the main idea of the last paragraph?
A.The great uses of baobab trees
B.The danger of losing baobab trees.
C.How baobab trees help other plants
D.The importance of protecting the environment.

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【推荐1】The hemlock(铁杉) trees along the Wappinger Creek, New York, look healthy. However, scientist Gary Lovett says the white balls which provide protection for the bugs are created by a tiny insect. It’s hard to believe the tiny bug could kill a tree. However, trees can end up with millions and millions of the pests. When there are that many, it ends up killing the tree.

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Many invasive pests arrive on wooden pallets piled inside shipping containers. They support and separate goods, and keep them from sliding around. Invasive pests often tunnel into the pallets.   How can we stop pests from riding on pallets? Lovett says new rules are needed. The companies that make pallets don’t want more rules. Congress has added an amendment(修正案) in the 2018 Farm Bill to try and prevent this problem. However, Lovett is not hopeful it will make much of a difference. Pallets are checked by inspectors. Many are sprayed with bug-killing pesticide. “I believe in the system,” said Brent McClendon, president of The National Wooden Pallet and Container Association. He also said shipping containers are checked very carefully.

Still, each year 13 million containers are shipped to the U.S. Each is full of wooden pallets. Lovett says: “Inspectors can’t possibly check everything. All it takes are a few bad pallets; we should get rid of wooden pallets.” He believes pallets should be made of plastic or eco-composite wood. Eco-composite wood is a mix of wood fiber and plastic. Insects cannot hide into it. One problem is that these choices cost more. They may be worth the extra money, though. Invasive pests cost the U.S. $5 billion a year. Trees don’t just die in forests. They also die in cities and our yards. Then, they need to be replaced. That costs money, too.

1. All the statements are TRUE except that ________.
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C.invasive pests hide in pallets used in shipping
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2. What can we infer from the passage?
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C.Bugs won’t bother the tree if just in few numbers.
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3. Why does Gary Lovett want to get rid of wooden pallets?
A.Because insects mostly die in them.
B.Because plastic pallets are eco-friendly.
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D.Because they are the major pest carriers.
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A.Invasive pests are harming plants in the USA.
B.Effective measures have stopped the pest invasion.
C.Congress contributes a lot to dealing with invasive pests.
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【推荐2】The zebra belongs to the horse family. One of nature’s great mysteries is why the zebra has stripes. One theory is that the stripes help the zebra cool down. On hot days the black stripes get a lot hotter than the white area of the zebra and under the black stripes there are special layers of fat for protection. Hot air then rises off the black stripes, forcing colder air down around the white areas, cooling the zebra down This, however, is just a kind of theory. The stripes can also confuse predators when zebras stay with other animals in great numbers.

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