问题 选择题

发表《物种起源》,建立生物进化理论的科学家是(   )
A.达尔文B.赫胥黎C.哥白尼D.伽利略

答案

A

题目分析:1859年达尔文发表《物种起源》,标志生物进化论建立;B 不对,赫胥黎是达尔文进化论的支持者;C不对,哥白尼主要是提出“日心说”;D 不对,伽利略发现了自由落体定律等物理学定律,开创了以实验事实为根据并具有严密逻辑体系的近代科学,为经典力学的创立和发展奠定了基础。

点评:生物学的发展

①19世纪前期,德国人施莱登和施旺相继提出和确立了细胞和细胞学说,为进化论的诞生奠定了基础。

②拉马克等具有早期进化思想的科学家认识到生物界中不同物种之间不仅存在联系,而且物种是可变的。

③1859年,达尔文《物种起源》的发表,标志着生物进化论的诞生。

读图填空题
单项选择题

A

Napoga is a 12-year-old girl in Ghana(加纳), Africa. It is hard for her family to get clean water. Every morning, she leaves home at half past five to get clean water for her family in a village far away. It takes her six hours to get enough clean water for daily (日常的) cooking and drinking. She has no time to go to school or to play with her friends. Millions of people in the world are like Napoga. They can’t get enough clean water to keep healthy.

Earth Day is April 22. But on all other days, we must also remember it. The water we use is the most important natural resource(自然资源) on the earth.

Water covers 70% of the earth’s surface(表面). But most of that is sea water. We can’t use it for very many things. Fresh water covers only 1% of the earth’s surface.

You probably feel lucky that your life isn’t as hard as Napoga’s. But that doesn’t mean you don’t have to worry about water. We all face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers, lakes, and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish, too. Now, 34% of all kinds of fish are dying out.

How do cars and factories make our water dirty First, they pollute the air. Then, when it rains, the rain water comes down and makes our drinking water dirty. Dirty rain, called acid rain (酸雨), is also bad for plants, animals and buildings.

Scientists say that in 30 years, more than half of the people in the world won’t have enough clean water. We have to learn how to save more water for ourselves and our children. Here is some advice for saving water:

Turn off the water while you brush your teeth. You can save as much as 450 liters (升) each month.

Leaky taps(水的龙头) waste a lot of water. Fix them right away!

You can easily cut your 1O-minute showers(沐浴) in half—and you’ll be just as clean.

When you wash dishes, don’t let the water run.

Only wash clothes when you have a lot to wash. If your washing machine isn’t full, you’re wasting water!

Acid rain ().

A.is only bad for living things

B.can be produced in factories

C.doesn’t do harm to people, but it’s bad for plants, animals and buildings

D.doesn’t just do harm to human beings but to animals, plants and buildings