1.D　细节理解题。根据第二段内容可知,A项、B项和C项是正确的,而D项不正确。故选D项。

　　2.B　细节理解题。事情发生的先后顺序:先是太阳释放出紫外线,然后紫外线造成自由基的生成,接着自由基破坏我们身体的细胞,最后皮肤起皱纹。故选B项。

　　3.C　细节理解题。根据第四段第三、四句“However,they get weaker as we get older.The body’s built-in defences can only go so far without extra help.”可知,应选C项。

　　4.A　推理判断题。最后一段提到,紫外线、被污染的空气以及人体自身都会产生自由基。而由第五段第一句“The key to...and match colors.”可知,摄入不同颜色的食物可以帮助我们抵抗自由基的形成,故A项不符合文意,选A项。

　　二、语法填空(共10小题;每小题1.5分,满分15分)

　　Dear fellow students,

　　May I have your attention,please?Now I’d like to make a speech here.1. we know,waste has become a common phenomenon on campus.Some pour the remains of a meal when there is still much 2.(leave);others simply walk away after washing hands,leaving the water 3.(run);students leave the classroom every day 4. noticing whether fans are switched off.Has thrift(节俭),one of the most national traditions 5. developed from our long history gone?6. so,find it back! 

　　We don’t have to take great pains to control waste,but actions and a grateful heart are needed;thank the water that runs through our fingers,and save it for poor Arabian or African countries struggling in water 7.(short);thank the light we enjoy,because children share a dim(昏暗的) lamp 8.(read) in poor areas;thank all the paper we are able to use,for trees are cut down to satisfy 9. needs;thank everything 10.(natural) can offer and everything we can own. 

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