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. Kara attends a university where students study for an average (arithmetic mean) of 13.4 hours per week. How many hours per week does Kara study (1) The standard deviation of study time at Kara’s school is 2.8. (2) Kara’s study time is one standard deviation away from the mean.

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单项选择题Many geologists theorize that the trail of volcanic craters and cinder cones along the Snake River plain of southern Idaho was produced as the North American continent slid westward over a stationary plume, a vertical channel through which molten rock rose intermittently from the Earth’s core to burst through its crust. Which of the following, if true, tends to support the geologists’ theory of how the trail was produced

A. The largest craters and cinder cones are on the eastern margin of the trail.
B. The most violent volcanic activity apparently occurred at the western margin of the trail.
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.
E. The craters grid cinder cones on the western margin of the trail generally took longer to form than did those on the eastern margin.

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.