单项选择题

A．It doesn’’t need to be refueled.
B．It will use solar energy as fuel.
C．It will be driven by electrical power.
D．It will be more suitable for long distance travel.
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单项选择题
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.
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.
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
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