20.閱讀短文,根據(jù)短文內(nèi)容和首字母提示寫出文中所缺單詞.
Skin-diving is a new sport today.This sport takes you into a wonderful new world.It is like a (80)visitto the moon.When you are under water,it is easy for you to climb  big rocks,because you are no longer heavy.
Here,under water,everything is blue and green.During the day,there is plenty of light.You can catch fish with your hands when they (81)swimnearby.
When you have tanks of air on your back,you can stay in deep water for a long time.You must be (82)carefulwhen you dive in deep water,because it is very dangerous.To catch fish is one of the most interesting parts of this sport.Besides,there are more uses for skin-diving.You can clean ships without taking them out of water.You can get many things (83)fromthe deep sea.
Now you see that skin-diving is both useful and interesting.

分析 這篇短文主要介紹了一種新型的運動--潛泳.并講述了這種運動的一些特點.

解答 80.visit考查名詞的辨析.空格前是冠詞,此處應(yīng)該是名詞,結(jié)合句意:這就像是去月球的一次旅行.故填visit.
81.swim考查動詞的辨析.空格前是主語,此處應(yīng)該是動詞,結(jié)合句意:當(dāng)你在附近游泳時,你可以用手抓魚.故填swim.
82.careful考查形容詞的辨析.空格前是be,此處應(yīng)該是形容詞,結(jié)合句意:當(dāng)你在深水中潛水時,一定要小心,因為它非常危險,故填careful.
83.from考查介詞的辨析.結(jié)合句意:你可以從深海得到很多東西.from,介詞,從,故填from.

點評 做這類題,不但要選擇正確意義的詞、詞組及句型,還要根據(jù)具體語法和語境,選擇適當(dāng)?shù)臅r態(tài)、語態(tài)及使用正確的詞形.

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