24. The MP4 my father bought me on my birthday isn’t missing; it still _____ where I _____ it several days ago.
A. lies; lay |
B. lies; laid |
C. lays; laid |
D. lays; lay |
23. Is it twenty years that it may be _____ his father drank last?
A. that |
B. since |
C. when |
D. before |
22. When her father fell into a serious disease, she would sit before the window with her eyes _____ at the street without thinking anything.
A. stare |
B. stared |
C. to stare |
D. staring |
第一节:单项填空(共15小题;每小题1分,满分15分)
请从A, B, C, D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该选项的标号涂黑。
21. _____ is acknowledged to us is that Qian Xuesheng _____ great contributions to our country's agriculture.
A. As; has done |
B. It; does do |
C. What; did do |
D. What; did did |
22.(本题满分15分)
已知a为实数,函数,
(1)若a=1,求函数的极值;
(2)求函数在上的最小值;
21.(本题满分15分) 已知函数在R上是奇函数,且在处取得极值.
(Ⅰ)求函数的解析式及其单调区间;
(Ⅱ)若对任意的实数、,求证:。
20.(本题满分14分)已知递增的等比数列满足,且是的等差中项.
(Ⅰ)求数列的通项公式;
(Ⅱ)若,是数列的前项和,求使成立的的最小值.
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