第一节：单项选择（共15 小题；每小题1分，满分15分）
请认真阅读下面各题，从题中所给的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。
21. It was very ______ of you to send me a postcard when you were on holiday in Hong Kong.
A. considerable B. innocent C. considerate D. unconscious
22. The same color can _________ different meanings in different countries.
A. respond to B. correspond with
C. correspond to D. respond in
