单项选择题

Because of the （）, we have to keep a sharp lookout.

A. poor visibility
B. good visibility
C. good weather
D. dry weather

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In the （）weather, we have to open the navigational light.

A.frog
B.foggy
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we use （）to carry something.

A. chisel
B. drill
C. handcart
D. hand saw
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