单项选择题
（）with the size of the whole earth, the highest mountain does not seem high at all.
A. When compared B. When comparing C. Compare D. Comparing
单项选择题 Had electronic computers not been invented, many problems of space flight（）now.
单项选择题 There has been a decrease（）the number of students entering the Medical College this year.
单项选择题 His use of technical terms let his audience（）
