Teaching students of threshold level is hard work
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Teaching students of threshold level is hard work but the effort is very 【worthwhile】．
A.precious
B.rewarding
C.worth
D.challenging
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答案：B
教入门级的学生需要付出大量努力，但结果很另人欣慰。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”, 最符合题意，例如：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．例如：The house is worth a lot of money．这栋房子值很多钱。challenging“有挑战的”，例如：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。