According to the second paragraph, crows are poor subjects for field research for all the following reasons EXCEPT ______.
A. they can successfully avoid observers
B. they are hard to distinguish from one another
C. they can be quite aggressive
D. they are difficult to catch
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Experiments showed that nondrinkers had______.
A. higher blood pressure
B. lower blood pressure
C. larger amounts of' good cholesterol
D. smaller amounts of good cholesterol
The man we had arrested doesn't ______ your description of the thief.
A. answer to
B. respond to
C. account for
D. fit in with
唯物辩证法和形而上学两种发展观的斗争焦点在于
A. 是否承认联系的观点
B. 是否承认发展的观点
C. 是否承认内部矛盾的观点
D. 是否承认质变的观点
How was garbage usually disposed of during the eighteenth century
All the garbage was burned.
B. All the garbage was thrown into the river directly.
C. Most of garbage was recycled.
D. Garbage was transported to a remote dumpsite.