单项选择题

What is learned about Robert Regan?
A．He is a university professor.
B．He is CEO of a major corporation.
C．He works for the federal government.
D．He travels for 2 months of every year.

A.He
B.
B．He
C.
C．He
D.
D．He
E.

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2009年10月1日大阅兵中，最后一个“明天更美好”方阵持续行进，5000多名少年儿童让手中彩色气球腾空而起，并与天安门广场前成千上万的青少年一起涌向金水桥.随着气球的升高，大气压越来越（）（选填“高”或“低”），当其内部压强（）（选填“大于”或“小于”）外界气压时，放飞的气球随之爆炸.

答案：低；大于

单项选择题

Which of the following was one of Dr. MacLeod's accomplishments?
A．He helped develop a university program.
B．He won a national prize for his research.
C．He founded a scientific research institute.
D．He ran a successful pharmaceutical company.

A.He
B.
B．He
C.
C．He
D.
D．He
E.