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
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. What is the value of x²-y² (1)x+y=2x (2)x+y=0

A. 条件(1)充分，但条件(2)不充分．
B. 条件(2)充分，但条件(1)不充分．
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D. 条件(1)充分，条件(2)也充分．
E. 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

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单项选择题According to a recent cross-cultural study, married people in general have longer life expectancies than do people who divorce and do not remarry. This fact indicates that the stress associated with divorce adversely affects health. Which of the following, if true, points to a weakness in the argument above

A. Overall life expectancies differ among countries, even among countries with similar cultures.
B. People often show signs of stress when undergoing a divorce.
C. Life expectancy varies with age-group, even among married people.
D. Stress of many kinds has been shown to affect health adversely.
E. Adults who have never married have shorter life expectancies than do married people of the same age.

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C. The craters and cinder cones are evenly spaced throughout the extent of the trail.
D. The newest craters and cinder cones are on the eastern margin of the trail.
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