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    5．应该鼓励高中学生参加各种各样的社会活动以拓宽他们的眼界．（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．
    这是表达的对事物的一种看法，所以用一般现在时．
    根据句意"应该鼓励高中学生参加"可知用被动语态更能够形象的表达出句子的意思，be encouraged to do sth．被鼓励去做某事；participate in参加；expand their horizons拓宽眼界．

    点评 a variety of的同义表达：
    a variety of=a range of=a lot of=lots of=a diversity of=a good/great many=quantities of

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