24._________, my tears couldn’t help raining down my cheeks.
A.Hearing the touching news B.Having heard the touching news
C.After I heard the touching news D.I had heard the touching news
23.Most experts predict that all these changes will lead to a strong and powerful China, ________ that can surprise the whole world.
A.what B.one C.the one D.which
22.- Why don’t you take a taxi there? It’ll save you a lot of time.
- _________.
A.Thank you anyway! B.Yes, let’s.
C.Good idea! D.That’s all right.
第一节 单项选择(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
21.X-rays were first discovered by _______ German scientist, Wilhelm K.Rontgen, in 1895, almost by ________ accident.
A. the, / B.a, an C.a, / D.the, the
22.三棱柱ABC-A1B1C1中,AB⊥侧面BB1C1C,E在棱CC1上,E不在C、C1处,AE⊥EB1,已知AB=,BB1=2,BC=1,
(1)求异面直线AB与EB1的距离
(2)求A-EB1-A1的正切值
21.四棱锥P-ABCD,底面是直角梯形,∠ABC=∠BCD=900,AB=BC=PB=PC=2CD,面PBC⊥面ABCD
(1)求P-BD-C大小
(2)证明:面PAD⊥平面PAB
20.棱长为4的正方体AC1中,O是A1B1C1D1中心,P在棱CC1上,且CC1=4CP,O在D1AP上的射影为H。
(1)证明:D1H⊥AP
(2)求点P到面ABD1的距离
19.正三棱柱ABC-A1B1C1各棱长都为1,M是底面上BC边的中点,N在侧棱CC1上,且
(1)求证:AB1⊥MN
(2)求M点到直线AB1的距离。
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com