问题 选择题
双曲线
x2
16
-
y2
9
=1的离心率e=(  )
A.5B.
5
C.
5
2
D.
5
4
答案

∵双曲线的方程是

x2
16
-
y2
9
=1

∴a2=16,b2=9,

∴c2=a2+b2=25

∴a=4,c=5

∴离心率为e=

c
a
=
5
4

故选D.

选择题
翻译题

完成句子

1.________how difficult it was for a woman to get medical training at that time.(hit)

我突然想到在那个时候对于一个女性来讲进行医疗训练是多么的困难.

2.Knowledge,in many girls' eyes,________appearances,as a result,they spend more time

dressing up instead of studying hard.(second)

在许多女孩的眼中,知识不如外表重要,因此,她们花更多的时间打扮而不是努力学习.

3.Only when the civil war was over in 1949________return to China and devoted herself

to the education cause.(allow)

只有在1949年内战结束的时候她才回到中国并且献身于教育事业.

4.To be honest________working conditions for factory workers.(worthwhile)

老实说,改善工人的工作环境是值得的.

5.Dr.Smith,together with his wife and daughters,________since they settled in China five

years ago.(lead)

史密斯博士和他的妻子女儿们自从五年前在中国定居以来一直过着幸福的生活.

6.MostChinese parents argue that children________at home by their parents and that they

should be always concentrating on studies.(take)

大部分中国父母争辩说孩子在家由他们的父母照顾,他们应该一直专心于学习.

7.Either you or the headmaster________the prizes to these gifted students at the meeting.(hand)

你或者校长已经被邀请在会上给那些有天赋的学生们颁发奖品.

8.________as you come across new words while reading.(refer)

在你阅读的时候遇到生词就查字典.

9.Those who don't receive a college education tend to ________in this family.(look)

在这个家庭里,那些没受过大学教育的人往往会被瞧不起.

10.This morning I looked through the books in the bookshop,________children.(intend)

今天早上我在书店浏览了大部分供孩子使用的书籍.