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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

A.frog
B.foggy
C.forest
D.fox

單項(xiàng)選擇題

we use （）to carry something.

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