考博考试

【单选题】 The most important consideration for manned space flight is that the rocket be ______.
A．inexpensive to construct
B．capable of lifting heavy spacecraft into orbit
C．easily controlled
D．inexpensive to operate

网考网参考答案：C
网考网解析：
文中提到manned space flight needs the fine adjustments only be provided by liquid fuels，而前文讲了液体燃料火箭rocket engine can be stopped completely：it can be re-ignited when desired，可以判断manned space flight对火箭最重要的要求是易于操控，选项C正确。 查看试题解析出处>>