26. It’s reported that the police will soon ____ the case of two missing children.

A. look into　　 B. look after 　　C. look upon　　 D. look out

25. Tom is keen _____ surfing the Internet in his spare time.

　 A. at　　　　 B. on　　　　 C. to　　　　 D. in

24. The students were completely _____ in their reading.

　 A. absorbing　　 B. being absorbed 　　C. to absorb　　 D. absorbed

23. She missed the plane, _____ driving very fast to the airport.

　 A. unless　　　 B. despite　　 C. though　　　 D. without

22. My brother is really _____. He often works in his office far into the night.

A. open-minded　 B. hard-working 　C. self-confident　 D. warm-hearted

第一节　 单项填空(共15小题；每小题1分，满分15分)　

　　 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

21. There is ____ universal concept among ____ parents that the more they feed their kids, the healthier they will grow up to be.

A. an, the　　　 B. a, the　　　 C. a, /　　　 D. /, the

22、设圆上的点是等可能分布的，作圆的内接,求是锐角三角形的概率.

黑龙江省鹤岗一中09-10学年高二下学期4月月考

21、已知曲线C的极坐标方程是．以极点为平面直角坐标系的原点，极轴为x轴的正半轴，建立平面直角坐标系，直线l的参数方程是：(是参数).

(1)将曲线C的极坐标方程和直线参数方程转化为普通方程；

　 (2)若直线l与曲线C相交于A、B两点，且，试求实数值.