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【判断题】
The thumbs-up signal is positive in North America and Australia, but is rude in West Africa.A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】The two Harvard economists note in their study that, for much of the 20th century, ________.
A.
enrollment kept decreasing in virtually all American colleges and universities
B.
the labor market preferred high-school to college graduates
C.
competition for university admissions was far more fierce than today
D.
the gap between the earnings of college and high-school graduates narrowed
【单选题】One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
A.
which
B.
as
C.
that
D.
what
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