单项选择题

Before writing a book, _________.

A. you must first ponder what to say and what not to be said carefully
B. it’s extremely necessary that you know what to say
C. you must first ponder what to say and what not to say
D. the first thing is to consider what to say
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单项选择题
To have a computer without being connected to the Web is like having an old radio when everybody else has a color TV. That helps explain ______ businesses are setting up Net sites even though profits are nowhere to see.
A. reasons
B. the reason why
C. why that
D. why
单项选择题
Which of the following is the best title for the passage
A．Metropolitan Statistical Areas.
B．Types of Population Centers.
C．The Bureau of the Census.
D．Megapolises,
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