单项选择题

A．Working over time as a librarian.
B．Writing papers for his classes.
C．Meeting with his professors.
D．Doing extra work in the chemistry lab.
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单项选择题
A．Two years.B．Long-term goals.C．Current activities.D．The goals that have been completed.
A．Two years.
B．Long-term goals.
C．Current activities.
D．The goals that have been completed.
单项选择题
The author compares rain forests to coral reefs because ______.
A．they are approximately the same size
B．they share many similar features
C．most of their inhabitants require water
D．both have many different forms of life
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