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單項選擇題

A signal indicating Greenwich mean time would be preceded with（）.

A.a code hoist to indicate Greenwich mean time to follow
B.the letter G
C.the letters GT
D.the letter Z

單項選擇題

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

A.darkening，growing in size and forming an anvil top
B.that shows extensive vertical development
C.creating cold downdrafts that are felt on the ground
D.All of the above