1 . 根据句子内容，从每组的选项中选出能匹配句中划线部分意义的选项。选项中有两项为多余选项。

A. a person, team, etc. that has won a competition in a sport B. an official document proving that you have completed a course of study C. to remove or reduce an unpleasant feeling or pain D. a competitor that is thought to have little chance of winning E. in every way possible, completely, totally F. to prevent sth from being done or make sth impossible to do G. to some extent, partly

1. She didn’t like the subject of computer engineering but she stuck it out to get the certificate.
2. Most of the crowd were cheering for the underdog to win this time.
3. My son usually goes for a run before exams to relieve tension.
4. The high cost prohibits many people from taking up this sport.
5. That’s entirely different from the previous principle.