函数y=sin（﹣2x+ π3 ）的单调递减区间是

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函数y=sin（﹣2x+ π

3

）的单调递减区间是（）

A：kπ﹣ $\frac{π}{12}$ ，kπ+ $\frac{5 π}{12}$ ，k∈Z

B：2kπ﹣ $\frac{π}{12}$ ，2kπ+ $\frac{5 π}{12}$ ，k∈Z

C：kπ﹣ $\frac{π}{6}$ ，kπ+ $\frac{5 π}{6}$ ，k∈Z

D：2kπ﹣ $\frac{π}{6}$ ，2kπ+ $\frac{5 π}{6}$ ，k∈Z

上一题下一题 0.0难度选择题更新时间:2017-07-26 06:51:30

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A

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　　①Life in the future will be different from life today.

But what will life be like in the future? The population(人口)is growing A . There will be many people in the world and most of them will live to over 100 years old. Computers will be very B and useful, and there will be computers in every home. Travelling will be very cheap and C .

And many people will go to other countries for holidays. There will be changes in our food, too. There will not be________(many)room for cows and sheep, so meat will be very expensive. ②也许没有人会每天都吃它。They will eat many fruits and vegetables. Maybe people will be quite healthy. Work in the future will be different, too. Robots will do hard work. So many people will not have enough work to do.

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