单项选择题

A．One sixth of them are seriously polluted.
B．One third of them are seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
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单项选择题
A．In a laboratory.B．In a drugstore.C．In a supermarket.D．In the dining hall.
A．In a laboratory.
B．In a drugstore.
C．In a supermarket.
D．In the dining hall.
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.
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