问题
选择题
已知集合P={x|x2≤1}，M={a}，若P∪M=P，则a的取值范围是[ ]
A、(-∞，-1]
B、[1，+∞)
C、[-1，1]
D、(-∞，-1]∪[1，+∞)
答案
答案：C
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已知集合P={x|x2≤1}，M={a}，若P∪M=P，则a的取值范围是[ ]
A、(-∞，-1]
B、[1，+∞)
C、[-1，1]
D、(-∞，-1]∪[1，+∞)
答案：C
根据短文内容，选择适当的单词或短语填空，使短文意思完整。每个选项至多使用一次，有两项剩余。答案填写到答题纸指定位置。
Unluckily, many people have trouble in getting enough 小题2:.______. There are many reasons such as lack (缺乏) of time, energy, and places to do it. At the same time, too many people are putting 小题3:. ______ food into their bodies than they burn. If you eat more than you need, you will put on 小题4:. ______. If you take in fewer calories than you burn, you will lose weight. You can regularly 小题5:. ______ a small number of calories with everyday activities such as doing housework, climbing stairs, and washing dishes. To 小题6:. ______, that’s not enough. Running 5 miles can burn about 500-600 calories, 小题7:. ______ it’s hard for most people. In fact, you don’t need to run 5 miles a day to stay fit. There are easy ways to get enough daily exercise. 小题8:. ______, walking burns 8 calories per minute, and jogging (慢跑) burns 20 calories per minute. |