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【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
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参考解析:
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举一反三

【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

【单选题】In the conclusion, the author does not_______.

A.
suggest what should happen next
B.
make a prediction
C.
give a warning