题目内容：

阅读下面短文，从短文后各题所给的四个选项(A、B、C 和 D)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。

Mac was cycling along a road in Canada’s Yukon, halfway through a 2,750-mile bike tour to Prudhoe Bay, Alaska. He was carrying a 30-pound camping bag,     he wasn’t moving very fast. Suddenly he heard loud breathing behind him. “Man, that’s a big dog!” he thought. He looked to the side, but to his great     , he saw that it wasn’t a dog, but a wolf, running hard to    him.

   Mac’s heart jumped. He reached for the    from his bag. With one hand on the handle bar, he    the spray. A bright red cloud covered the wolf    , and it fell back, shaking its head. But a minute later it was by his side again. He sprayed a second time, and the wolf fell    again, but only to quickly restart its      .

   The wolf was getting closer and closer,    a dozen yards away. Mac waved and yelled at passing motorists, but meanwhile    hard. He knew clearly that he must be       not to slow down. Otherwise, he would become a     of the wolf. Paul and Becky were driving along the same road. From a distance, they spotted what they     was a dog running after a man on a bike. As they got     , they realized it was a wolf.

    Mac heard a car coming up behind him, and he slowed down. The car veered (改变方向)around the        , then suddenly stopped in front of him. Mac      off his bike and dashed for the back         of the car. It was locked. Paul quickly       the door so as to let Mac in, and the          man dived in, shutting the door behind him.

   It was quite a while before Mac became       and cried out: “I thought I was going to die!” And Paul and Becky were glad that they had given a helping hand to people in need.

1.A. but   B. so    C. for   D. or

2. A. regret   B. disappointment  C. fear   D. anger

3.A. catch up with B. break away from  C. give in to  D. come back to

4.A. hammer   B. stick    C. gun   D. spray

5.A. dropped  B. fired    C. threw   D. held

6.A. in turn   B. at last    C. in time  D. at random

7.A. back   B. down    C. behind  D. over

8.A. flight   B. race    C. journey  D. attack

9.A. still   B. just    C. also   D. even

10.A. kicked   B. rode    C. hit   D. pressed

11.A. crazy   B. wrong    C. careful  D. fair

12. A. victim  B. competitor   C. killer   D. protector

13.A. decided  B. declared   C. assumed  D. found

14.A. faster   B. closer    C. stronger  D. wiser

15.A. climber   B. motorist   C. cyclist   D. runner

16. A. sent   B. fell    C. turned   D. jumped

17.A. window  B. seat    C. door   D. wheel

18.A. bent   B. struck    C. blocked  D. unlocked

19.A. frightened  B. worried   C. discouraged D. confused

20.A. brave   B. calm    C. optimistic  D. confident