單項(xiàng)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

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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

單項(xiàng)選擇題

A shipmate suffers a heart attack and stops breathing. You must（）.

A.administer oxygen
B.immediately check his pulse and start CPR
C.make the victim comfortable in a bunk
D.immediately give a stimulant，by force if necessary