25. Now we can pick up ____ weather information from a new type of ____ weather satellite.
A. the, / B. the, the C. /, / D. /, a
24. --- London Bus Service, how can I help you?
--- Hi, I’d like to rent a bus which can ____ 40 people for our trip to Cambridge.
A. load B. hold C. fill D. support
23. More than 10,000 relics, ____ between 5,000 to 3,000 BC, ____ at Sanxingdui since it was first discovered.
A. dating back to, was dug up B. dating back to, have been dug up
C. dated back to, has been dug up D. dated back to, were dug up
22. The youth after 80’s are believed to be selfish and irresponsible, so experts suggest young parents should ____ their children to care about others.
A. bring up B. bring out C. bring in D. bring about
第一节 单项选择(共15小题;每题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 there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.
A. original B. alternative C. convenient D. staple
22.(本小题12分)
四面体中,,分别是的中点,且为正三角形,平面.
①求与平面所成角的大小;
②求二面角的平面角的余弦值.
哈三中2009-2010学年度下学期
21.(本小题12分)
四棱锥中,底面,且,底面是菱形;点在平面内的射影恰为的重心.
①求的长;
②求二面角的平面角的余弦值.
20.(本小题12分)
已知斜三棱柱的底面是正三角形,侧面是边长为2的菱形,
且,是的中点,.
①求证:平面;
②求点到平面的距离.
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