单项选择题

A．Some pessimistic experts.
B．Environmentalists.
C．Some optimistic experts.
D．All of the above.
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单项选择题
A．Exploring the web.B．Using the library.C．Searching the bookstore.D．Not given.
A．Exploring the web.
B．Using the library.
C．Searching the bookstore.
D．Not given.
单项选择题
A．Searching for reference material.B．Watching a film of the 1930s’’.C．Writing a course book.D．Looking for a job in a movie studio.
A．Searching for reference material.
B．Watching a film of the 1930s’’.
C．Writing a course book.
D．Looking for a job in a movie studio.
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