26.So many natural disasters are believed over the recent years because of the frequent unreasonable mankind activities.
A.to have come about B.to come about
C.coming about D.to be coming about
25.---How does the girl we met just now strike you?
---She is but beautiful.
A.anything B.anybody C.everything D.everybody
24.The whole team were wild with joy when their captain top in the race.
A.came up B.came out C.turned up D.went out
23.---It is said we may have got the result of the exam by the end of next month, won’t we?
---Sure. .You’ll be informed in time.
A.With pleasure B.No wonder C.It doesn’t matter D.Take your time
22.---Was your holiday trip to Europe amazing?
---Not really! But we got back safe, before the European airspace restriction caused by the Icelandic volcano ashes.
A.narrowly B.successfully C.smoothly D.thankfully
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,并在答题卡上将该项涂黑。
21. Haitian man, according to his family, has survived four weeks under ruins since
destructive earthquake this January.
A.The; a B.The;/ C.A;/ D.A; the
23.(本小题满分10分)
将一枚硬币连续抛掷
次,每次抛掷互不影响. 记正面向上的次数为奇数的概率为
,正面向上的次数为偶数的概率为
.
(Ⅰ)若该硬币均匀,试求
与
;
(Ⅱ)若该硬币有暇疵,且每次正面向上的概率为
,试比较
与
的大小.
22.(本小题满分10分)
已知动圆
过点
且与直线
相切.
(Ⅰ)求点
的轨迹
的方程;
(Ⅱ)过点
作一条直线交轨迹
于
两点,轨迹
在
两点处的切线相交于点
,
为线段
的中点,求证:
轴.
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