第二部分英语知识运用(共两节，满分45分)
第一节: 单项填空(共15小题；每小题l分，满分l5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. — Can you keep an eye on my bag, Tom? I just want to use the bathroom.
—____. It will be safe with me.
A. Go ahead B. I think so C. Not at all D. You’re welcome
22. The warmth of ____sweater will of course be determined by the sort of ____wool used.
A. the, the B. the, / C. /, the D. /,/
23. It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
A. which B. what C. who D. that
24. ____ late in the morning, Bob turned off the alarm.
A. To sleep B. Sleeping C. Sleep D. Having slept
25. They also agree that it is the burning of more and more fossil fuels that has resulted ____ this increase
in carbon dioxide.
