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.

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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