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單項選擇題

Chart legends printed in capital letters show that the associated landmark is（）.

A.conspicuous
B.inconspicuous
C.a government facility or station
D.a radio transmitter

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單項選擇題

After the passage of a cold front the visibility（）.

A.does not change
B.improves rapidly
C.improves only slightly
D.becomes poor

單項選擇題

Advise you（）engines．

A.stop
B.to stop
C.stopping
D.stopped