单项选择题

The body’s need for()salt can be met by a healthy diet, without turning to ______salt bottle.

A. the; a
B. /; the
C. /; /
D. the; the

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单项选择题
The staff have been informed that under no circumstances()the telephone in the office for personal calls.

A. may they use
B. they use
C. they could use
D. did they use
单项选择题
Why do scientists put bands on penguins’ flippers()

A. So they can identify the birds from a distance.
B. They want to slow them down as they swim.
C. The bands protect them from being attacked.
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