问题
选择题
设m，n∈Z，已知函数f(x)=log2(-|x|+4)的定义域是[m，n]，值域是[0，2]，若函数g(x)=2|x-1|+m+1有唯一的零点，则m+n=[ ]
A.2
B.-1
C.1
D.0
答案
答案：C
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设m，n∈Z，已知函数f(x)=log2(-|x|+4)的定义域是[m，n]，值域是[0，2]，若函数g(x)=2|x-1|+m+1有唯一的零点，则m+n=[ ]
A.2
B.-1
C.1
D.0
答案：C
When July comes, children know they’ll have ________(1) examinations and the school year will end soon. Boys and girls will have a nearly two months’ holiday, and they’ll leave school ________(2) train or by car to ________(3) to see their fathers and mothers . The summer holidays are the ________(4) time of the year for most children. The weather is usually good, so one can ________(5) most of his time playing outside. If one lives in the country, he can ________(6) into the woods and in the fields. If one lives in a big town, he can usually go to a park to play. The best place for a summer holiday is the ________(7). Some children are ________(8) enough to live near the sea. But for the others who do not, if they have the chance to stay at one of the big seaside towns for a week or two, they will talk about it all the following school year. Now, ________(9) makes children like the seaside so much? I think it is the sand, the sea and the sun, not anything else. Of course, there are ________(10) new things to see, nice things to eat, and interesting things to do. But the feeling of sand under their feet, of salt water on their skin, and the feeling of the warm sun on their backs make them happier.
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