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问题 选择题

We want to know ______ better.[ ]

A. what to swim

B. how to swim

C. swimming

D. to swim

答案

答案：B

单项选择题

治疗弥漫性泛细支气管炎首选的药物是（）。

A.青霉素

B.红霉素

C.环丙沙星

D.利福平

E.氨曲南
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单项选择题

An investor is considering the purchase of two bonds. One of the bonds is tax-exempt and yields 4.5% while the other bond is taxable and yields 6.0%. If the two bonds are alike in all other characteristics, the marginal tax rate that would make the investor indifferent between the two bonds is closest to:（）

A. 9.0%.

B. 25.0%.

C. 27.0%.
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