第一节： 语法和词汇知识（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. When the spaceship traveled above, ____new-looking earth appeared before us, ____earth that we had never seen before.
A. a; the B. a; an C. the; an D. / ;the
22.Susan was expecting her favorite singers, but to her disappointment,
appeared.
A．some B．everyone C．none D．no one
