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问题 选择题

Let's ________the monkeys in the zoo.  [ ]

A. look                        

B. to look at  

C. see                         

D. to watch

答案

答案：C

解答题
已知△ABC的三个内角A、B、C满足A＞B＞C，其中B=60°，且sinA-sinC+
2
2
cos(A-C)=
2
2
．
（1）求A、B、C的大小；
（2）求函数f（x）=sin（2x+A）在区间[0，
π
2
]上的最大值与最小值．
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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．(E) Adults who have never married have shorter life expectancies than do married people of the same age.
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