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

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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