填空题

In the author’s opinion, what generates the daily rhythms

【参考答案】

The animals themselves.
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填空题
Experiments in which animals live in artificial surroundings show that
单项选择题
A．Because it is a personal and economic problem as well as a social one.B．Because it is a totally personal problem.C．Because it is a huge burden on economics.D．Because it is social problem.
A．Because it is a personal and economic problem as well as a social one.
B．Because it is a totally personal problem.
C．Because it is a huge burden on economics.
D．Because it is social problem.
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