| 1. 单选题 | 详细信息 |
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We must thank trees ____ oxygen into the air .
A . produce
B . to produce
C . for produce
D . for producing
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| 2. 单选题 | 详细信息 |
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Trees can protect ( 保护 ) _____ by producing a chemical.
A . himself
B . itself
C . themself
D . themselves
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| 3. 单选题 | 详细信息 |
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People are destroying their best fighters _____ pollution.
A . for
B . by
C . against
D . in
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| 4. 单选题 | 详细信息 |
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I'm going to the library today. I need some ______ about trees.
A . information
B . informations
C . advice
D . news
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| 5. 单选题 | 详细信息 |
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I can't imagine a world _______ water.
A . for
B . without
C . with
D . at
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| 6. 单选题 | 详细信息 |
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Be quiet! The students _______ a class now.
A . is having
B . have
C . are having
D . has
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| 7. 单选题 | 详细信息 |
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We ________ oxygen _______ the air and release ( 释放 ) CO2 into the air.
A . take in，from
B . release，into
C . take，into
D . release，from
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| 8. 单选题 | 详细信息 |
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The medicine kept the patient _______ for another month.
A . live
B . to live
C . alive
D . lived
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| 9. 单选题 | 详细信息 |
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We can get many things _______ trees.
A . out of
B . on
C . in
D . from
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| 10. 单选题 | 详细信息 |
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Look! All people _______ fun at the beach.
A . has
B . having
C . have
D . are having
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