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单项选择题

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

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

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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

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

单项选择题What is a possible negative effect of olestra according to some crit ics

A．It may impair the digestive system.
B．It may affect the overall fat intake.
C．It may increase the risk of cancer.
D．It may spoil the consumers' appetite.

单项选择题The main idea of this passage is that ______.

A．better use of greenspace facilities should be made so as to improve the quality of our life
B．attention must be directed to the improvement of recreative possibilities
C．the urban environment is providing more recreation activities than it did many years ago
D．priority must be given to the development of obligatory activities

单项选择题According to the author, the importance of greenspaces in the urban environment______.

A．is still unknown
B．is being closely studied
C．is usually neglected
D．has been fully recognized