环境是影响机体生命和生长的____________________的总和。

单词拼写。

1.It was announced that local universities will be reducing e______. As a result, about 200 workers,

mostly sanitary workers will lose their jobs.

2.The famous violin player, Jim Smith, has been arrested for tax evasion. Smith said he is i______,

but many people think he is guilty.

3.I am writing this article to give you a quick ______ (预览)of what to expect from university life either

in China or abroad.

4.Many young people say the high pay will m______ them to work hard and put in one hundred percent

effort.

5.When m______ the floor, Marry slipped and hurt her ankle.

6.My mother is old now with grey hair and w______ on her forehead, but she is still full of energy.

7.This sweater is not of high quality. I'm worried about washing it in case it ______. (缩水)

8.Despite the accident, the fact that China's high-speed train is advanced and qualified is still _______.

(鼓舞人心的)

9.There has been a plane crash in a big pond in Eastern Europe. And doctors and nurses are at the

s_______ to give oxygen and other medical supplies to the survivors.

10.A particular goal is very important to you on your way to success. If you are a______, you will

lack direction and end up in failure.

溃疡性结肠炎的病变大多位于（）。

A.空肠

B.末段回肠

C.回盲部

D.全结肠

E.直肠、乙状结肠

采取（）等措施，可防止粉尘危害。

A、密闭，湿式作业

B、通风，隔热

C、消声，吸声

D、隔热，消声

下列哪项不是蛔虫病流行广泛的原因（）

A.蛔虫产卵量大

B.生活史简单，卵在外界可直接发育为感染期卵

C.虫卵抵抗力强

D.感染阶段可经多种途径感染人体

E.粪便管理不当，个人卫生习惯不良

某投资者以10元的价格购买某股票，持有6个月后以12.5元卖出，则他的资本年收益率是（）。

A.25%

B.22.5%

C.50%

D.60%