21．—how long are you staying?
—i don't know.________.
a．that's ok b．never mind
c．it depends d．it doesn't matter
[解析]it depends视情况而定。that's ok“没关系，别客气”；never mind“不要紧，没关系”；it doesn't matter没关系。
[答案]c
22．(2011·沈阳二中测试)chinese culture，has become ________ interest for people all over the world since the shanghai expo and many foreigners are discovering ________ history of china.
a．the；/ b．an；the
c．an；/ d．the；the
[解析]第一空为抽象名词具体化，an interest一件有趣的事；第二空为定指，用
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