第Ⅰ卷（选择题 共60分）
一、单项选择（共15小题，每小题1分，计15分）
从A、B、C、D四个选项中选出一个可以填入句中空白处的最佳答案。
1. Christopher Columbus was ______explorer from ______European country.
A. a; an B. an; an C. an; a D. a;a
2.— _______ will the haze last?
—We have no idea. There’s no sign of an end.
A. How often B. How long C. How soon D. How far
3. How excited we are ______ the coming English oral exams _____ March 17th.
A. thinking of ; on B. to think of; on C. thinking of ; in D. to think of; in
4. New types of energy from the sun, wind and water are not expensive and will never ______.
A. put out B. come out C. break out D. run out
