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问题 单项选择题

A型内斜多伴有（）

A.下斜肌亢进

B.下斜肌减弱

C.上斜肌亢进

D.上斜肌减弱

E.外直肌亢进

答案

参考答案：C

解析：上斜肌在下转时有外转作用，其亢进常与A型斜视伴行。

填空题

菱形ABCD的对角线的长分别为2和5，P是对角线AC上任一点（点P不与点A、C重合），且PE∥BC交AB于E，PF∥CD交AD于F，则阴影部分的面积是（    ）。

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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.

In isosceles triangle ABC, what is the value of ∠C ？（）
(1) The measure of ∠B is 47°
(2) The measure of ∠A is 90°

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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