单项选择题

Experiments enable young scientists to judge accurately what must be accepted and what must be viewed with suspicion.()

A. doubt
B. belief
C. curiosity
D. judgment

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单项选择题
The sensation of a lump in one's throat arises from an increased flow of blood into the tissues of the pharynx and larynx.
A. explanation
B. disease
C. feeling
D. unpleasantness
单项选择题
In the process，the light energy converts to heat energy．
A．reduces
B．changes
C．leaves
D．drops
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