(三)德育渗透点
通过对解题方法和规律的概括,了解个性与共性.特殊与一般间的关系,培养辩证唯物主义观点,又从有理有据的论证过程中培养严谨的学风.
(二)能力训练点
通过严格的推理论证,培养逻辑思维能力,发展空间想象能力.
(一)知识教学点
掌握利用平面的基本性质证明诸点共面、诸线共面、三点共线、三线共点问题的一般方法.
1.证明若干点或直线共面通常有两种思路
(1)先由部分元素确定若干平面,再证明这些平面重合,如例1之①;
(2)先由部分元素确定一个平面,再证明其余元素在这平面内,如例1之②.
2.证明三点共线,通常先确定经过两点的直线是某两个平面的交线,再证明第三点是这两个平面的公共点,即该点分别在这两个平面内,如例2.
3.证明三线共点通常先证其中的两条直线相交于一点,然后再证第三条直线经过这一点,如练习.
100. -Need he come a little earlier? -Yes, he _________.
A. can B. must C need D. needn’t
1~10 C C B A A A D A B B 11~20 B A A A B C D B C A 21~30 A A A A B B D A B A
31~40 D A C B A D D A D D 41~50 D B C C D D D A B D 51~60 B C A A C B A C A B
61~70 B C D C D C B D A C71~80 A A B A B B B D C D81~90 B D D C D B C A D C
91~100 C C B D C D A C D B
99.There is _______ W in the word woman, and ________ M is the third letter of the word.
A. a; an B. an; / C. an; the D. a; the
98.We can’t buy ________ much mutton with ________ little money.
A. so, much B. such, so C. so, so D. such, such
97. -(At the doctor’s) It’s nothing serious, doctor? -No, _________.
A. you’ll be all right soon B. You won’t be all right soon
B. There’s some trouble with you D. It’s very serious
96.Lucy, ________ all your things on the desk.
A. puts away B. put away C. takes away D. take away
95.You must leave here now _________ your mother can get some more rest.
A. became B. though C. so that D. so
94.She doesn’t know the school, but it’s __________ to be quite a good one.
A. told B. spoken C. talked D. said
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