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单项选择题

According to Judy what did her professor photograph

A．Oceanic snails,
B．Large green jellyfish.
C．Different planktonic plants.
D．Sunken treasure chests.

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单项选择题What is the author’s main concern

A．How to render automobiles pollution-free.
B．How to make smaller and safer automobiles.
C．How to solve the problem of traffic jams.
D．How to develop an automated subway system.

单项选择题According to the author, green-space facilities should be designed in such a way that______.

A．more obligatory activities might take on a recreative aspect
B．more and more people might have access to them
C．an increasing number of recreative activities might be developed
D．recreative activities might be brought into our homes