第二节 （共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
“You do not need to be a rocket scientist.” Americans hear these words often.
People say them in schools, offices and factories. Broadcasters on radio and television use them.
How did the expression begin? No one seems to know it. 66 “It grew,” he says, “because rocket scientists probably are the most intelligent people around.”
Not everyone would agree. Some people might be considered more intelligent than rocket scientists. For example, a person who speaks and reads fifteen languages, or a medical doctor who operates on the brain. Still, many people would agree that there is something special about scientists who build rockets. 67
Moving pictures from before World War II showed a man named Buck Rogers landing on the planet Mars. He was a hero who could withdraw any enemy from outer space. The rocket scientist is a different kind of hero. 68
Rocket scientists, however, can have problems just like everyone else. A Washington rocket scientist tells about a launch that was postponed many, many times. Finally, everything seemed right. Mechanical failures had been repaired. The weather was good. The scientists had planned that part of the rocket would fall into the ocean after the launch. All ships and boats within many kilometers of the danger area had been warned. But in the last few seconds a small boat entered the area. 69
70 One scientist said, "As a child I loved to build rockets. Now I am grown. I still love to build rockets. And now I get paid for it."

A．he or she makes space travel possible.

B．It’s dangerous for rocket scientists to build rockets.

C．Maybe it has something to do with the mystery of space travel.

D．When the work goes well, most rocket scientists enjoy their jobs.

E. Have you ever heard of the space travel?
F. But an official of the American space agency, NASA, says the expression just grew.
G. Once again, the launch was put off.