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25.     two exams to worry about ,I have to work really hard his weekend.

A. With              B. Besides           C. As for            D. Because of

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24. It was in the very house     was built of stone     he spent this childhood.

 A. that;that           B. that;where       

C. where;that         D. which;where

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23.-Could you lend me a hand and take these exercise books to the classroom?

  -     .

 A. For pleasure         B. I could              

C. My pleasure         D. With pleasure

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22.      we gave him something to eat, he would save it up for his little sister.

 A. Whatever            B. However          C. Whenever         D. Whichever

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第一节    语法和词汇知识(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. As is known to all ,     great scientific achievements may have     positive effect on our life as well as society.

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

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21、理科做(14分)

已知椭圆C的中心在坐标原点,焦点在x轴上,椭圆C上的点到焦点距离的最长值为3,最小值为1.

(1)求椭圆C的标准方程

(2)若直线l:y=kx+m与椭圆C相交于A,B两点(A,B不是左右顶点)且以AB为直径的圆过椭圆C的右顶点,求证:直线l过定点,并求出该定点的坐标.

和县一中09-10学年度第一学期期中检测

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21、文科做(14分)

已知椭圆  +=1(a>b>0)的一个顶点为A(0,1)离心率为,过点B(0,-2)

及左焦点F1的直线交椭圆于C,D两点,右焦点设为F2

(1)求椭圆的方程

(2)求△CDF2的面积

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20、(13分)已知三棱柱ABC-A1B1C1  的三视图如下图所示,其中主视图AA1BB1和左视图B1BC C1均为矩形,俯视图A1B1C1中A1 C1=3,A1 B1=5,cos=

(1)在三棱柱ABC-A1B1C1中,求证:BCAC1;

(2)在三棱柱ABC-A1B1C1中,若D是底边AB的中点,求证:AC1//平面CDB1

(3)若三棱柱的高为5,求三视图中左视图的面积.

 

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