25. _________ did the students realize that they were mistaken about spiders.
A. It was until then B. It was not until then
C. Not until then D. Not until when
24. Fans from miles around crowded into the stadium for the concert of Jay Chou on September 4th, 2010, _________ are popular with teenagers.
A. many of his songs B. many of whose songs
C. many of which songs D. and many of whose songs
23. --- Can you balance your ________?
--- Sure. Low as my salary is, I can make both ends meet.
A. expense B. income C. budget D. target
22. The young teacher made ________ silly mistake and out of _________respect for his feelings, I didn’t point it out in class.
A. the; the B. the; / C. a; the D. a; /
第一節(jié) 單項(xiàng)填空(共15小題;每小題l分,滿分15分)
從A、B、C、D四個(gè)選項(xiàng)中,選出可以填入空白處的最佳選項(xiàng),并在答題卡上將該項(xiàng)涂黑。
21.-Putting on a happy face not only helps us make friends but also makes us feel better.
-_________.
A. I’ m with you on that B. I’ d love to C. It’ s up to you D. It’ s my pleasure
21.(本小題滿分12分)
已知函數(shù)
(Ⅰ)求函數(shù)的定義域,并證明在定義域上是奇函數(shù);
(Ⅱ)對(duì)于恒成立,求實(shí)數(shù)的取值范圍;
(Ⅲ)當(dāng)時(shí),試比較與的大小關(guān)系.
20.(本小題滿分14分)
已知橢圓的左、右焦點(diǎn)分別為,點(diǎn)是軸上方橢圓上的一點(diǎn),且, , .
(Ⅰ) 求橢圓的方程和點(diǎn)的坐標(biāo);
(Ⅱ)判斷以為直徑的圓與以橢圓的長(zhǎng)軸為直徑的圓的位置關(guān)系;
(Ⅲ)若點(diǎn)是橢圓:上的任意一點(diǎn),是橢圓的一個(gè)焦點(diǎn),探究以為直徑的圓與以橢圓的長(zhǎng)軸為直徑的圓的位置關(guān)系.
19.(本小題滿分14分)
已知等差數(shù)列的公差大于0,且是方程的兩根,數(shù)列的前n項(xiàng)的和為,且.
(Ⅰ) 求數(shù)列,的通項(xiàng)公式;
(Ⅱ)記,求證:;
(Ⅲ)求數(shù)列的前項(xiàng)和.
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