5.The conference has been held to discuss the of global warming on people’s lives all over the world.
A.importance B.effects C.protection D.attitudes
4.一Why didn't you come to Mike’s birthday party yesterday?
-Well,I , but I had something important to do at the moment.
A.should B.must C.should have D.must have
3.Many of the scientists and engineers are judged how great their achievements are.
A.in spite of B.in charge of C.in favor of D.in terms of
2.You will have to wait for one more week, the manager will be back from his trip.
A.after B.while C.when D.since
第一节:单项填空(共20小题;每小题0.5分,满分10分)
从A、B、C、D四个选项中,选出可以填人空白处的最佳选项。
1.Sad to say,nowadays many people are still in habit of writing silly things in public places.
A.the;不填 B.不填;不填 C.the; the D.不填;the
2.将选定的题号按规定要求先用2B铅笔填写在答题纸上的“题号”框内,确定后再用签字笔或钢笔描黑,否则答题视作无效。
22.已知过点A(-4,0)的动直线与抛物线
相交于B、C两点。当
的斜率是
。
(1)求抛物线C的方程;
(2)设BC的中垂线在y轴上的截距为b,求b的取值范围。
21.已知函数处有两上不同的极值点,设
在点
处切线为
其斜率为
;在点
利的切线为
,其斜率为
(1)若
(2)若,求
的取值范围。
19.已知
(1)求的最大值及取得最大值时相应的x的值;
(2)若函数上恰有两上零点
的值。
20.如图,三棱柱ABC-A1B1C1,侧棱与底面垂直,AB=AC=1,AA1=2,P、Q、M分别是棱BB1、CC1、B1C1的中点,AB⊥AQ。
(1)求证:AC⊥A1P;
(2)求证:AQ//面A1PM;
(3)求AQ与面BCC1B1所成角的大小。
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