问题 选择题

动物细胞与植物细胞的结构不同,导致了它们有丝分裂的不同,这是因为植物细胞[ ]

A.有叶绿体和细胞壁

B.有细胞壁和液泡

C.有细胞壁,无中心体

D.有叶绿体和液泡

答案

答案:C

阅读理解

阅读理解。

                                                        

     Running is becoming popular these days. Many of us run for our health. Doctors say many of the health

problems come from these bad habits: eating too much, drinking too much, smoking, and not taking enough

exercise. Doctors tell us, "Eat and drink less, don't smoke, and exercise more."

     Running is a good form of exercise because it helps build a strong heart. It also helps most people lose

weight. One 68-year-old woman runs thee times a week. She runs to lose weight. "I love to eat," she says.

     Running is good for health in other ways, too. Many runners say running keeps colds and other small

health problems away. "Running is my doctor," says one man.

     Running can also help people lo relax. So today men and women of all ages enjoy running.

1. Many people enjoy running because they want to ______.

A. eat much

B. keep healthy

C. run fast

D. waste time

2. Doctors tell us _____.

A. not to smoke

B. not to exercise

C. to drink much

D. to eat much

3. The underlined word "weight" means _____.

A. 疾病

B. 体重

C. 速度

D. 健康

4. The third paragraph (段落) shows _____.

A. running helps people to relax

B. running people have many health problems

C. running helps build a strong heart

D. running people have few health problems

5. The writer mainly tells us _____.

A. how to run

B. how to lose weight

C. running is a good way to keep healthy

D. running is better than doctors

选择题