对环境监测的管理由国务院环境保护行政主管部门建立( )，制定监测规范。
A．监测制度
B．监测小组
C．监测主管部门
D．监测委员会
参考答案：A
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。
时态填空。
1. After he cut out the paper, he ________ (write) something on it with a brush.
2. I will look after him until his mother ________ (come) back.
3. What great fun it is ________ (watch) my goldfish ________ (swim) around!
4. _______ (bring) me one more apple, please. ________ (eat) more fruit is good for our health.
5. It's important ________ (not give) the little dog too much food.
6. He ________ (be) late for school again this morning because he _______ (not catch) the early bus.
7. You need to take a rest after ________ (run) so long.
