单项选择题

Scientists are expected to carry out thoroughgoing studies to back up claim's made concerning new drugs.

A．support
B．elevate
C．investigate
D．challenge
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单项选择题
The relatively theory is basically made up of two parts: the restricted and the general relativity theory.
A．fundamentally
B．usually
C．frequently
D．approximately
单项选择题
Embroidery depicting scenic views became popular in the United States toward the end of the eighteenth century.
A．stating
B．relating
C．portraying
D．celebrating
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