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问题 单项选择题

口腔预防教研室集体备课时，李老师指出牙周疾病流行病学中的影响流行的因素主要是（）。

A．地区分布和时间分布

B．年龄性别与民族差异

C．不同国家和城乡区别

D．摄氟量与饮食习惯

E．口腔卫生的好坏

答案

参考答案：E

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.

MegaTech and UltraCorp are considering a merger to form the MegaUltraTech Corporation. Does MegaTech have more employees than UltraCorp ？（）
(1) The average (arithmetic mean) age of UltraCorp employees is 32.8, while the average age of MegaTech employees is 27.2.
(2) If the merger goes through and all employees from both companies remain employed, the average (arithmetic mean) age of the MegaUltraTech employees will be 31.4.

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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单项选择题 A1型题

《金匮要略方论》一书最早的校订整理者是（）

A.王叔和

B.王洙

C.赵开美

D.林亿等
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