第I卷 选择题（共40分）
一、单项填空（共15小题；每小题1分，满分15分）
从A、B、C和D四个选项中，选出可以填入空白处的最佳选项，并在答卷纸
上将该项涂黑。
1. —Our school is planning __________ one-day trip to Niushou Hill.
—Really? It must be fun, I think.
A. a B. an C. the D. 不填
2. The terrible accident happened _________ a cold winter morning and the police arrived at the scene within 5 minutes.
A. in B. to C. at D. on
3. __________ he is good at playing basketball, he failed to join the school basketball team yesterday.
A. Since B. Unless C. Because D. Though
