以下区域中，初级生产力最高的区域是 ( )A．海洋 B．草原 C．海陆交接地带 发布时间：2018-01-04 23:20 │ 来源：www.tikuol.com 题型：单项选择题 问题： 以下区域中，初级生产力最高的区域是 ( )A．海洋B．草原C．海陆交接地带D．农田
题型：单项选择题 已知函数f（x）=ax2+1（a＞0），g（x）=x3+bx。（1）若曲线y=f（x）与曲线y=g（x）在它们的交点（1，c）处有公共切线，求a，b的值；（2）当a=3，b=-9时，函数f（x）+g（x）在区间[k，2]上的最大值为28，求k的取值范围。 查看答案
题型：单项选择题 选用方框中词的适当形式完成短文。go work get up take eat sell watch like have get My uncle __1__ in a big store. He works very long hours. He usually __2__ at six ten. He has a shower and __3__ breakfast at seven-twenty. After breakfast he __4__ the bus to the store. He __5__ all kinds of sweaters and T-shirts in his store. Now they __6__ some sweaters at a good price in the store . He has lunch at one-twenty. At around five-thirty he __8__ home. He has dinner with us. Then he __8__ TV. After that he __9__ to bed at nine. He__10__ his job very much. 查看答案
题型：单项选择题 Internet bars mustn't let people under 18 in or let anybody _ bad things. [ ]A. watch B. to watch C. watching D. watches 查看答案