单项选择题

The students take a ______ test in March, and the main exam is in July.

A．previous
B．preliminary
C．preceded
D．elementary
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单项选择题
Digging the garden with a spade is a very ______ task. I am exhausted after such two-hour's work.
A．industrious
B．manual
C．conscientious
D．laborious
单项选择题
There is a direct flight at 3:00 or a flight at 7:30 in the morning that ______ in Los Angeles.
A．stops by
B．stops in
C．stops over
D．stops up
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