1. The Vikings are believed ___________ America. A. to have discovered B. to discover C. in discovering D. to have been discovered ...

20. __________ is the richest man in this town? A. Whom do you think B. Who do you think C. Do you think who D. Who you think ...

17. Certian layers of the atmosphere have special names _______________. A. which indicated their characteristic properties B. whose characteristic properties are indicating C. what characterize their indicated properties D. that indic...

9. Last night, before the exam, I went over the lessons_______I couldn’t keep my eyes open to stay awake any longer． A. before B. until C. unless D. when ...

17. According to the passage, immigrants choose to settle in the U.S., dreaming that _____________. A. they will make a fortune overnight there B. they can be more competitive in business C. they can start profitable businesses there D...

7. Tom was born _________ . A. inthelatesixtys B. onthelatesixty C. inthelatesixties D. inlatesixties ...

1. —What a great cook your sister is! —Yeah! We ______ never have enough of her cookies． A. may B. must C. should D. Can ...

7. More than one ___________ dismissed. A. have been B. has been C. were D. has ...

3. 多媒体技术总的发展趋势是具有更好、更自然的交互性，更大范围的信息存取服务。 （ ） A. 错误 B. 正确 ...

1. 目前音频卡具备以下（）功能 A. 录制和回放数字音频文件 B. 混音 C. 语音特征识别 D. 实时解／压缩数字单频文件 ...