单项选择题

A single barometric pressure reading of 28.60 indicates（）.

A.rapidly improving weather
B.deteriorating weather
C.a severe low pressure system
D.fair weather and calm

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A signal indicating zone time is preceded with the letter（）.

A.L
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A sign of thunderstorm development is a cumulus cloud（）.

A.darkening，growing in size and forming an anvil top
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