6. 如果数列对任意满足,且,则等于()
A.1024 B.512 C.510 D.256
5. 过点且方向为的光线经过直线反射后通过椭圆的左焦点,则这个椭圆的焦距长等于( )
A.1 B. C. 2 D. 4
4. 若,则角的终边落在( )上
A. B.
C. D.
2. 已知幂函数的图象经过点,则的值为(. )
A. B. C.2 D.1
1. 若条件:复数是纯虚数,条件:,则是的( . )
A.充分不必要条件 B.必要不充分条件
C.充要条件 D.既不充分也不必要条件
11. Now more and more students are getting hear-sighted in schools because they have paid little attention to the care
of their eyes.
即时练习:
英国有句俗话,“Early to bed and early to rise, make a man healthy, wealthy and wise.”请以 “Form a Good Habit” 为题,谈谈早起的好处。
[写作内容]
a) 有些学生迟到,是因为晚起;
b) 晚起不仅影响学习,而且也是一种坏习惯;
c) 早起是一种好习惯,因为它能给你带来很多好处。早起有助于身体健康,有助于学习,有助于品德培养。
[写作要求]
只能使用5个句子表达全部内容(开头结尾已经给出)。
参考词汇:品德培养:train character
Some students are often lat for class because they get up late.
I hope everyone will form the good habit of getting up early.
10. There are many ways of keeping good health.
9. As we all know, spending too much time on TV may have bad effects on our work and health, especially on our eyes.
8. From now on, we ought to break away from the bad habit and form a good one.
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