21. We must try our best to lower the cost of our products．Otherwise the high cost will ____ our profit. A. cut off B. cut in C. cut short D. cut into ...

17. Californians and New Englanders speak the same language and ____by the same federal laws. A. stand B. conform C. abide D. sustain ...

13. ____ you may be right, I can’t altogether agree. A. As B. While C. If D. Since ...

8. I ____you that the machine will arrive next week. A. insist B. confirm C. assure D. undertake ...

4. With prices ____so much, it’s hard for the company to plan a budget. A. fluctuating B. waving C. swinging D. vibrating ...

45. Through reading the students not only learn new language, but also develop their reading skills. A. 错误 B. 正确 ...

11. An exercise with heterogeneity gives no opportunity for the really advanced students to exercise their capacity. A. 错误 B. 正确 ...

5. The vowel is produced without (or with little) restriction during its production and is always voiced. A. 错误 B. 正确 ...

18. In the “language awareness” exercise, the statement “The baby’s crying” informs about a third person’s whereabouts. A. 错误 B. 正确 ...

13. When the readers read to get the general picture, only the main points are what they are interested in, not the detail. A. 错误 B. 正确 ...