单项选择题

We learn from the passage that olestra is a substance that______.

A．contains plenty of nutrients
B．renders foods calorie-free while retaining their vitamins
C．makes foods easily digestible
D．makes foods fat-free while keeping them delicious

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单项选择题

The result of the research for an easily digestible fat turned out to be______.

A．commercially useless
B．just as anticipated
C．somewhat controversial
D．quite unexpected

单项选择题

In the eyes of the author, conventional opinion on conflict is______.

A．wrong
B．oversimplified
C．misleading
D．unclear