单项选择题

To the commander's great surprise, the helicopter ______ a light plane and both pilots were killed.

A．coincided with
B．stumbled on
C．tumbled to
D．collided to
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单项选择题
It is said that the newly appointed president is ______ of an artist.
A．anyone
B．somebody
C．something
D．anybody
单项选择题
With the success of experiments on vaccine against some forms of cancer, the research group has been ______ itself up for the furtherance of research in this field.
A．preparing
B．equipping
C．gearing
D．framing
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