第一部分：英语知识运用（共两节，满分50分）
第一节 单项填空（共20小题；每小题1分，满分20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。
1. Panama, ____ country in Central America, is the only place in the world ____ someone can see the sun rise on the Pacific Ocean and set on the Atlantic.
A. the, in what B. a, where C. /, where D. a, which
2. --- Sorry, Linda! I have to _______ now. Mum is calling me for supper.
---Ok, I’ll call back later. Enjoy your supper.
A. hang up B. break up C. give up D. hold up
