问题 单项选择题

所有河南来京打工人员都办理了暂住证;所有办暂住证的人员都获得了就业许可证;有些河南来京的打工人员当上了门卫;有些武术学校的学员当上了门卫;所有的武术学校的学员都未获得就业许可证。
如果上述情况是真的,无法断定为真的选项是( )。

A.有些河南来京打工人员是武术学校的学员
B.所有河南来京打工人员都获得了就业许可证
C.有些门卫有就业许可证
D.有些门卫没有就业许可证

答案

参考答案:A

解析: 考查直言命题。由题干“所有河南来京打工人员都办理了暂住证;所有办暂住汪的人员都获得了就业许可证”可知“所有河南来京打工人员都有就业许可证”,B项为真;结合“有些河南来京的打工人员当上了门卫”可知“有些门卫有就业许可证”,C项为真;由“有些武术学校的学员当上了门卫”和“所有的武术学校的学员都未获得就业许可证”可知“有些门卫没有就业许可证”,D项为真;
由“所有河南来京打工人员都有就业许可证”和“所有的武术学校的学员都未获得就业许可证”可知“所有河南来京打工人员都不是武术学校的学员”,因此A项为假。

单项选择题

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 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 on the earth.
Water covers 70% of the earth’s surface. 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, 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 each month.
· Leaky taps waste a lot of water. Fix them right away!
· You can easily cut your 10-minute showers 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 !

Which of the following wastes water

A.We need ten minutes if we want a clean shower.

B.We should put in enough clothes when we wash them in washing machines.

C.You can keep yourself clean by having a shower for five minutes.

D.Don’t let the water run when we brush our teeth and wash dishes.

单项选择题