单项选择题

We may infer from this passage that the whole set of World English consists of______ units.

A．ten
B．thirty
C．sixty
D．more than sixty
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单项选择题
Suppose you are a student of Senior Three,______ will be suitable for you if you want to make your English better.
A．Books One and Two
B．Books Three and Four
C．Books Five and Six
D．None of them.
单项选择题
This passage is probably taken from the______ of an English textbook.
A．contents
B．introduction
C．first chapter
D．index (索引)
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