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 often use them.
How did the expression begin? No one seems to know it. 56 “It grew,” he says, “Because rocket scientists probably are the most intelligent people around.”
