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

2023-07-03

A:precious
B:rewarding
C:worth
D:challenging

参考答案：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。