温室效应．又称“花房效应”，是大气保温效应的俗称。大气能使太阳短波辐射到达地面，但地表向外放出的长波热辐射线却被大气吸收，这样就使地表与低层大气温度增高，因其作用类似于栽培农作物的温室．故名温室效应。自工业革命以来．人类向大气中排入的二氧化碳等吸热性强的温室气体逐年增加，大气的温室效应也随之增强，已引起全球气候变暖等一系列严重问题，引起了全世界各国的关注。以下属于温室效应对环境影响的是（）。
A．气候转变
B．地
C．海平面上升
D．土地干旱，沙漠化面积增大
参考答案：A, B, C, D
解析：
温室效应对环境的影响有：①气候转变…一全球变暧；②地球上的病虫害增加…一温室效应可使史前致命病毒威胁人类；③海平面上升；④气候反常，海洋风暴增多；⑤土地干旱，沙漠化面积增大，故选ABCD。
“USA? Britain? Which country is better to study in?” We often hear such discussions. As China open its door, it is a dream for many Chinese students to study abroad. They want to learn about the outside world. It’s true that studying abroad can help students develop themselves. Their foreign language skills will be improved and it may be easier to find jobs. But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language. Students must also learn to live without parents’ care and deal with all kinds of things they haven’t to do before, like looking after themselves. There are reports about Chineses students abroad running into an ocean of difficulties and giving up finally. When they have to take care of themselves, it is hard for students to study well. Finally, studying abroad brings a heavy burden to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth it? We know that there are many famous people who have achieved success through their hard work in China. Liu Xiang is a good example. Once an American teacher invited him there, but he refused. He kept training hard with his Chinese teacher. He surprised the world when he won a gold medal at the Athens Olympic Games. So when you winder which country is better to study in, think it again.
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