It can be inferred from the story that ______ During his flights, John H. Glenn, Jr. , could always reach a ______

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问题 It can be inferred from the story that ______
During his flights, John H. Glenn, Jr. , could always reach a ______

选项 A、tracking station
B、ship at sea
C、Mercury capsule
D、city of Perth

答案A

解析 答案可参见第三段中Glenn could always reach one of eighteen tracking stations,其余选项不符合题意。
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