单项选择题
A．the Apollo mission was very successful B．protection from space radiation is no easy job C．astronauts will have deformed children of grandchildren D．radiation is not a threat to well protection space explorers
A. They are afraid that they would again be isolated from American society in general B. People would think that Asian students rely on their parents for success C. Asian Americans would be a threat to other minorities D. American academic achievements have taken on too strong an Asian character
A．take care not to be over-critical in his writing B．watch carefully to see that nobody else takes his job C．be careful to ensure that his comments retain their value D．be sure that his salary keeps pace with inflation