单项选择题

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A.They join the physics club.
B.They ask for an extension of the deadline.
C.They work on the assignment together.
D.They choose an easier assignment.
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单项选择题
According to the author, clinical trials of vitamin supplements ________.
A.often result in misleading conclusions
B.take time and will not produce conclusive results
C.should be conducted by scientists on a larger scale
D.appear to be a sheer waste of time and resources
单项选择题
A.Because she didn’’t find suitable courses.B.because the summer courses of this year were the same as before.C.Because her friends persuaded her to do so.D.Because she wants to do some different things.
A.Because she didn’’t find suitable courses.
B.because the summer courses of this year were the same as before.
C.Because her friends persuaded her to do so.
D.Because she wants to do some different things.
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