Ⅲ.补全短语

　　1．contrary to　　　　与......相反

　　2．different types of 不同类型的

　　3．mistake ... for ... 把......误认为......

　　4．be fit to do 适合做

　　5．follow the advice 采纳建议

　　6．result in 导致

　　7．watch for 留心；等待(某人出现或发生某事)

　　8．roll up 卷起来

　　1．[教材原句]Don't be frightened by sharks：you are 30 times more likely to be hit by lightning than be attacked by a shark.

　　不要惧怕鲨鱼，你被闪电击中的几率是遭受鲨鱼攻击几率的30倍。

　　[句型点拨]倍数表达法。

　　[佳句赏析]Sound travels more than four times faster in water than in air.

　　声音在水中传播的速度是在空气中传播速度的4倍多。

　　2．[教材原句]Though it may seem hard to believe, the bird the officer uses is the same bird often seen in public parks - the pigeon.

　　尽管似乎很难相信，但这位军官所用的鸟就是我们在公园里经常见到的--鸽子。

　　[句型点拨]though引导的让步状语从句。

　　[佳句赏析]It's quite pleasant today, though the wind is rather cool.

　　尽管风有点凉，但今天天气还是很不错的。

　　3．[教材原句]However, it was in war that they found their greatest use.

　　然而，是在战争期间他们发现了它们的最大用途。

　　[句型点拨]强调句型。

　　[佳句赏析]It was in Asia that the world's greatest cultures had their birth.

　　世界上最伟大的文化都起源于亚洲。

　　Shark attacks

　　There are nearly 400 different types of sharks, but only about 30 types are known to have attacked human beings. Many people know that the most dangerous shark is the great white shark, probably because they have seen the film Jaws. However, two other sharks are also rather dangerous: the tiger shark and the bull shark.

　　Contrary to what many people might assume, evidence shows that sharks seldom attack humans. There are three types of shark attacks. In the main type, the shark attacks you because it mistakes you for a fish, but when it tastes human flesh it decides to give up and swims away. In the second type, the shark pushes you with its nose to find out if you are fit to be eaten, and then bites you if it thinks you are. In the third type, the shark waits for you to swim by, and then attacks you suddenly. The last two types of attack more often result in the death of humans.

　　To reduce the risk of a shark attack, you should follow these suggestions.

　　·Do not swim in the dark. Sharks can still see you but you cannot see them.

　　·Do not go swimming in the ocean if you have a fresh wound.Sharks can smell blood over a long distance.

　　·Do not wear bright clothing or jewellery, because sharks are attracted to the flash of colours and bright objects.

　　·Stay in groups, as sharks usually avoid large numbers of people.

　　Recently, shark attacks have been increasing as water sports are becoming more popular. If a shark attacks you, follow the advice below.

　　·Keep calm. Do not panic.

　　·Hit the shark on the nose with your fist.

·Stick your finger in the shark's eye.