单项选择题

A．Turn to their classmates for help.
B．Make out the requirements for them.
C．Refer to the Internet for material.
D．Ask their professors to write for them.
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单项选择题
38（）

A．achieve
B．unemployed
C．courses
D．obscure
E．vividly
F．avoid
G．fruitless
H．applications
I．special
J．largely
K．little
L．materialize
M．diminish
N．increase
O．execution
单项选择题
A．Sunlight. B．Heat waves. C．Natural disaster. D．Low nighttime temperature.
A．Sunlight.
B．Heat waves.
C．Natural disaster.
D．Low nighttime temperature.
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