单项选择题

A．He left his notes in classroom.
B．He couldn’t write his notes.
C．He had an exam.
D．A classmate borrowed his notes
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单项选择题
According to the passage, the Muir Glacier has retreated because ______.
A．glaciers have been melting very gradually
B．the climate has been growing much warmer
C．the snowline has retreated on mountains
D．vegetation has been changing
单项选择题
According to the passage, ______ causes the most serious problem.
A．pollution
B．noise
C．population
D．traffic jam
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