C. compared to; the more D. comparing with; the more

17 Make sure that electricity in the lab ___ when you finish doing experiment.

　　A. will be turned off B. have been turned off C. is turned off D. turns off

18. _____ production up by 60% , the company has had another excellent year.

A. As B. For C. With D. Through

19---It was careless ___ you to have left your clothes outside all night.

--- My God! _____.

A. of; So did I B. for; So did you C. for; So were you D. of; So I did

20．The engine of the ship was out of order and the bad weather _____ the helplessness of the crew at sea.

A. turned out B. resulted from C. added to D. made up

参考答案：1.mixture 2.lectures 3.equipment 4.conclusion 5.department

6.react 7.floating 8.astonished 9.balanced 10.expands

1-5CDDBA 6-10DCABB 11---15BCAAB 16---20 CCCBC