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问题 单项选择题

缺钾性碱中毒时出现反常性酸性尿，原因是

A．肾远曲小管排K+减少，排H+增多

B．Na+-H+交换减少

C．肾小管对HCO3ˉ的重吸收增加

D．血中H2CO3升高

E．以上都不是

答案

参考答案：A

解析：
缺钾性碱中毒时出现反常性酸性尿，原因是肾远曲小管排K+减少，排H+增多。

选择题

Tom's jacket is black. ______ is blue. [ ]

A. I

B. My

C. Me

D. Mine

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单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

Do at least 20 percent of the people in country X who are over the age of 25 possess a college diploma ？（）
(1) In country X, among the population over the age of 25, 26 percent of the male population and 16 percent of the female population possess college diplomas.
(2) In country X, women account for 55 percent of the total population.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.
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