单项选择题

A．Writing papers for his classes.
B．Meeting with his professors.
C．Doing extra work in the chemistry lab.
D．Working overtime as a librarian.
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单项选择题
A．Collecting objects on the beach.B．Creating computer models.C．Mapping currents in the ocean.D．Tracking water pollution.
A．Collecting objects on the beach.
B．Creating computer models.
C．Mapping currents in the ocean.
D．Tracking water pollution.
单项选择题
A．He couldn’t find Professor Smith’s classroom.B．Professor Smith speaks too slowly.C．He didn’t understand Professor Smith’s lecture.D．Professor Smith kept the class late.
A．He couldn’t find Professor Smith’s classroom.
B．Professor Smith speaks too slowly.
C．He didn’t understand Professor Smith’s lecture.
D．Professor Smith kept the class late.
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