单项选择题

Learn as much as you can about a clinical trial （）

A、for some patients
B、before participation
C、in humans
D、medical knowledge
E、during the trial
F、candidates for clinical trials

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单项选择题
Leaver was stricken with cancer 50 years ago.（）

A、Right
B、Wrong
C、Not mentioned
单项选择题
5（）

A．So
B．But
C．Yet
D．Though
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