氮循环的主要生化过程包括固氮作用、硝化作用、反硝化作用和氨化作用。（）
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A．acquireB．convenientC．admireD．anxiety
A. acquire
B. convenient
C. admire
D. anxiety
A．roughB．daughterC．delightD．through
A. rough
B. daughter
C. delight
D. through
The main idea of the whole story is that ______.
A. butterflies like to be sprayed
B. birds are better than sprays to get rid of insects
C. the people in Illinois like to make bird houses
D. baby birds like to eat insects
A．offeredB．judgedC．checkedD．wondered
A. offered
B. judged
C. checked
D. wondered
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