During his flights, John H. Glenn, Jr. , could always reach a ______
A. tracking station
B. ship at sea
C. Mercury capsule
D. city of Perth
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经常项目和资本项目下都实现了货币自由兑换,该国货币才能被列为可兑换货币。 ()
A. 正确
B. 错误
【B20】
A. hero
B. success
C. welcomed
D. beauty
【B16】
A. joined in
B. set up
C. invited
D. worked in
【B18】
A. wanted
B. added
C. took
D. referred