24．-The experiment is of particular importance.

　　-I see. We will carry on with it ________ we can get enough money.

　A. unless　　B. though　　C. whether　　D. until

23．When people move to another country, they often try ________ the customs of their native land.

　A. to keep on　　　　　 B. to keep off

　C. to keep up　　　　　 D. keeping up

22．Although punctual himself, the professor was quite used ________ late for his lecture.

　A. to have students　　　　B. for students’ being

　C. for students to be　　　　 D. to students’ being

　第一节　单项填空(共15小题；每小题1分，满分15分)

　从A，B，C，D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑

21．Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.

　A. the; the　　　　　　 B. /;a

　C. /; the　　　　　　 D. the; a

　第一节　短文改错(共l0小题；每小题1分，满分10分)

　此题要求改正所给短文的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾(√)；如有错误(每行只有一个错误)，则按下列情况改正：

　该行多一个词：把多余的词用斜线(＼)划掉；在该行右边横线上写出该词，并也用斜线划掉；该行缺一个词：在缺词处加一个漏字符号(∧)；在该行右边横线上写出该加的词；该行错一个词，在错的词下划一个横线；在该行右边横线上写出改正后的词。注意：原行没有错的不要改。