单项选择题

The survival （）of some wild animals is not very high as they are ruthlessly hunted for their skins.

A. standard
B. scale
C. ratio
D. rate

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单项选择题
The department chairman ______ with thanks the assistance of all the faculty members for getting the celebration ready in a short time.
A. expresses
B. declares
C. announces
D. acknowledges
单项选择题
Chemistry is closely（）with other studies: physics, biology and so on.

A. corresponded
B. concerned
C. correlated
D. cooperated
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