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 rearch 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

Olestra is different from ordinary fats in that ______.

A．it passes through the intestines without being absorbed
B．it facilitates the absorption of vitamins by the body
C．it helps reduce the incidence of heart disease
D．it prevents excessive intake of vitamins