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【简答题】

Soccer and tennis are ( ) activities; they have very clear rules for players.

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参考解析:
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举一反三

【单选题】A healthy diet is vital to good health.

A.
necessary
B.
difficult to understand
C.
not obvious

【单选题】Researchers often conduct studies to learn more about how things work.

A.
to stop or slow something down
B.
to control
C.
to organize or do a particular activity

【单选题】In a way, the human body is a complex machine.

A.
easily understood
B.
very noticeable
C.
having many parts

【单选题】The example of Jake in the introduction is _______.

A.
the author's view
B.
a counterargument
C.
background information