单项选择题

Most of us think of sharks as dangerous, owing to lack of information rather than fear（）.

A．due to
B．because
C．as
D．for

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单项选择题
The discovery of the connection between aspirin and Reyes syndrome, a rare and deadly ailment, is a recent example of the caution with which drugs must be used, even for medical purposes（）.

A．disease
B．sick
C．ill
D．illness
单项选择题
What may be the oldest fossil footprint yet found was discovered in June 1968 by William J. Meister,a non-professional fossil collector（）.

A．a part-time
B．a spare-time
C．an untrained
D．an amateur
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