单项选择题

It is worth considering what makes" convenience" foods so popular, and______better ones of your own.

A. introduces
B. to introduce
C. introducing
D. introduced
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A tourist will easily lose his way in Beijing______he has a map or a guide.
A. if
B. because
C. unless
D. when
单项选择题
《全日制义务教育英语课程标准(实验稿)》四级目标中对课外阅读提出具体要求：除教材外，课外阅读量应累计达到______万词以上。
A．4
B．10
C．12
D．15
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