题目内容

Placebos may be harmful, because they may be used by ______.

A. doctors
B. false doctors or deceivers
C. researchers
D. scientists

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The author implies that Dorothea Dix's work with the insane was interrupted because of ______.

A. an illness
B. the Civil War
C. her trip to England
D. her grandmother's death

Matsuzawa wanted to find out the process of ageing could be ______.

Through using the brain is the best way to maintain good ______.

Genetic engineering is absolutely good for human.

A. Right
B. Wrong
C. Not mentioned