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【单选题】
In paragraph 2, why does the author mention that the period for different horseshoe crabs ranges from 22.2 to 25.5 hours?A.
To illustrate that an animal's internal clock seldom has a 24-hour cycle
B.
To argue that different horseshoe crabs will shift from daytime to nighttime vision at different times
C.
To illustrate the approximate range of the circadian rhythm of all animals
D.
To support the idea that external cues are the only factors affecting an animal's periodic behavior
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举一反三
【单选题】When Barth was a college student, he often shopped at thrift shops
A.
to save money.
B.
to save energy.
C.
to help the environment.
D.
to make friends with poor people.
【单选题】垂直度是限制实际表面或轴线相对于基准表面或轴线的垂直程度。当给定一个方向时，公差带是距离为公差值，且垂直于基准平面或直线或轴线的（）的区域。
A.
两个平行直线间
B.
两个平行平面间
C.
两个平行平面和平行直线间
D.
两个平行平面或平行直线间
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