单项选择题What is the most effective way to clean the air
单项选择题For what purpose does the pilot shut off all the engines
单项选择题What is the security problem of MySpace according to Buchanan
填空题The researchers did not expect that one’s genes may help determine______.
单项选择题Andy Hildebrand invented Auto-Tune ______.
单项选择题Why does the man want to take up Teaching English as a Foreign Language
填空题covers
单项选择题What causes the indoor air pollution according to the speaker
单项选择题A.He knows where to get a new map.B.He will help the woman read the map.C.He has already seen the library.D.He will go to the library as well.
单项选择题Why does the woman suggest the man cycle