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。
21．To this end, an all-round, balanced and effective reform of the international system is thus _______ must to prevent __________ future repeat．
A．the; the B．a; the C．a; a D．the; a
—How much farther shall we have to go?
—Another five miles until we reach the mountain _______.
| A．at a distance | B．in a distance | C．at distance | D．in the distance |
On yesterday interview, he didn’t make a(n)_________
at all; what’s the matter with him?
| A．apology | B．appearance | C．difference | D．change |
I think I was at school, ______I was staying with a friend during the vacation when I heard the news.
| A．even so | B．and then | C．so that | D．or else |
There were two boys in the lab, ________ did the experiment successfully.
| A．the clever of whom | B．the cleverer or whom |
| C．the clever of them | D．the more clever of them |
After the new technique was introduced the factory produced________cars in 1994 as the year before.
| A．as twice many | B．as many twice | C．twice as many | D．twice as |