已知x1，x2是一元二次方程x2+mx+n=0的两个实数根，且x12+x22+（

一件商品，现价180元，比原价便宜了20元，便宜了（  ）%。

不属于一次环境污染物的是（）

A.SO₂

B.可吸入颗粒物

C.甲基汞

D.NO_x

E.CO₂

下列关于肺炎的治疗正确的是（）

A.休克型肺炎首先应补充血容量

B.肺炎球菌肺炎应首选青霉素

C.发热患者应尽早使用退热药

D.对胸痛、咳嗽可以对症处理

E.有低氧血症者予以吸氧

阅读理解。

     Not many years ago, a wealthy and rather strange old man named Johnson lived alone in a village in the

south of England. He had made a lot of money in trading with foreign countries. When he was 75, he gave

￡12,000 to the village school to buy land and equipment for a children's playground.

     As a result of his kindness, many people came to visit him. Among them was a newspaperman. During

their talk, Johnson remarked that he was 75 and expected to live to be 100, and the newspaperman asked

him how he managed to be healthy at 75. Johnson had a sense of humor. He liked whisky and drank some

each day. "I have an injection (注射) in my neck each evening", he told the newspaperman, thinking of his

evening glass of whisky.

     The newspaperman did not understand what Johnson meant. In his newspaper he reported that Johnson

was 75 and had a daily injection in his neck. Within a week Johnson received thousands of letters from all

over Britain, asking him for the secret of his daily injection.

1. Johnson became a rich man through _____.[ ]

A. doing business

B. making whisky

C. cheating

D. buying and selling land

2. The gift of money to the school suggests that Johnson _____. [ ]

A. had no children

B. was a strange man

C. was very warm-hearted and fond of children

D. wanted people to know how rich he was

3. Many people wrote to Johnson probably to find out _____. [ ]

A. what kind of whisky he drank

B. how to live alone

C. how to become wealthy

D. in which part of the neck he had an injection each day

4. When Johnson said he had an injection in his neck each evening, he really meant that _____.[ ]

A. he liked drinking a glass of whisky in the evening

B. he needed an injection in the neck

C. a daily injecting in the evening would make him sleep well

D. there was something wrong with his neck

5. From the passage we can infer that Johnson would be very _____ after he read those people's letters.[ ]

A. miserable

B. glad

C. surprised

D. said

当客人要挑选并询问某一道菜肴时，不要（）

A、使用婉转的口气

B、用定性的语言

C、适当使用吸引人的语句