Many lifestyle patterns do such______great harm to health that they actually speed up ______weakening of the human body．

单项选择题—Do you know that Jack () a postman for about six years —Yes, I see.

A. has become
B. has turned
C. has changed
D. has been

单项选择题Some researchers feel that certain people have nervous systems particularly to hot, dry winds. They are what we call ______ weather sensitive people.

单项选择题The villagers have already known ______ we'll do is to build the bridge.

单项选择题Last year the number of students who graduated with a driving licence reached 200,000, a(n) () of 40,000 per year.

A. average
B. number
C. amount
D. quantity

单项选择题It is reported that some scientists in the United States have found a new ______ for cancer.

单项选择题Which of the following best explores American myth in the 20th century

单项选择题Betty advised me to label our luggage carefully in case it gets______in transit.

单项选择题There is a ______ of impatience in the tone of his voice.

单项选择题Does the TV say ______ happened in Iraq every day

单项选择题Gun control is a subject ______ Americans have argued for a long time.