Teaching students of threshold level is hard work but the effort is very worthwhile.

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问题 Teaching students of threshold level is hard work but the effort is very worthwhile.

选项 A、precious
B、rewarding
C、worth
D、challenging

答案B

解析 本句意思是“教入门级的学生需要付出大量努力,但这些努力是值得的”。precious“珍贵的”,例如,Pandas are precious creatures.熊猫是珍贵的动物。rewarding“值得的,有回报的”,它最符合题意,如:To spend some time in English is rewarding.花点时间学英语是值得的。worth“值得的”,多用be worth doing/sth.如:The house is worth a lot of money.这栋房子值很多钱。challenging“有挑战的”,如:I intend to give up my present post in order to get a more challenging opportunity.为了获得一个更有挑战性的工作机会,本人打算放弃目前的职位。
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