5．應(yīng)該鼓勵(lì)高中學(xué)生參加各種各樣的社會(huì)活動(dòng)以拓寬他們的眼界．（horizon）Highschoolstudentsshouldbeencouragedtoparticipateinavarietyofsocialactivitiestoexpandtheirhorizons．．

分析 High school students should be encouraged to participate in a variety of social activities to expand their horizons．

解答 High school students should be encouraged to participate in a variety of social activities to expand their horizons．
這是表達(dá)的對(duì)事物的一種看法，所以用一般現(xiàn)在時(shí)．
根據(jù)句意"應(yīng)該鼓勵(lì)高中學(xué)生參加"可知用被動(dòng)語(yǔ)態(tài)更能夠形象的表達(dá)出句子的意思，be encouraged to do sth．被鼓勵(lì)去做某事；participate in參加；expand their horizons拓寬眼界．

點(diǎn)評(píng) a variety of的同義表達(dá)：
a variety of=a range of=a lot of=lots of=a diversity of=a good/great many=quantities of

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