题目内容
（请给出正确答案）
When were the Shakers most active？
A．Between 1800 and 1850.
B．Between 1850 and 1900.
C．Between 1900 and 1950.
D．From 1950 to the present.
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更多“When were the Shakers most active？A．Between 1800 and 1850.B．Between 1850 and 1900.C．Betwee”相关的问题
A、increase
B、maintain
C、decrease
D、create
| They found themselves competing _____ foreign companies _____ a share of the market. |
[ ] |
| A. with; for B. for; against C. in; for D. against; in |
A、To be
B、Being
C、Been
D、Having been
Scientists have found that all kinds of plants give out VOCs when being attacked .It’s a plant’s way of crying out.But is anyone listening？Apparently.Because we can watch the neighbours react.
Some plants pump out smelly chemicals to keep insects away.But others do double duty .They pump out perfumes designed to attract different insects who are natural enemies to the attackers.Once they arrive,the tables are turned .The attacker who are natural enemies to the attackers . zxx|k Once they arrive,the tables are turned.The attacker who was lunching now becomes lunch.
In study after study,it appears that these chemical conversations help the neighbors .The damage is usually more serious on the first plant,but the neighbors ,relatively speaking ,stay safer because they heard the alarm and knew what to do.
Does this mean that plants talk to each other？ Scientists don’t know. Maybe the first plant just made a cry of pain or was sending a message to its own branches, and so, in effect, was talking to itself. Perhaps the neighbors just happened to “overhear” the cry. So information was exchanged, but it wasn’t a true, intentional back and forth.
Charles Darwin, over 150 years ago, imagined a world far busier, noisier and more intimate(亲密的) than the world we can see and hear. Our senses are weak. There’s a whole lot going on.
32. What does a plant do when it is under attack？
A. It makes noises.
B. It gets help from other plants.
C. It stands quietly
D. It sends out certain chemicals.
33. What does the author mean by “the tables are turned” in paragraph 3？
A. The attackers get attacked.
B. The insects gather under the table.
C. The plants get ready to fight back.
D. The perfumes attract natural enemies.
34.Scientists find from their studies that plants can .
A.predict natural disasters
B.protect themselves against insects
C.talk to one another intentionally
D.help their neighbors when necessary
35.what can we infer from the last paragraph？
A.The word is changing faster than ever.
B.People have stronger senses than before
C.The world is more complex than it seems
D.People in Darwin’s time were imaginative.
A、Since the Han Dynasty.
B、Since the Tang Dynasty.
C、Since the Song Dynasty.
D、Since the Ming and Qing Dynasties.
A、Attention
B、Action
C、Autonomy
D、Availability
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