The greenhouse gases ————————energy in the atmosphere and make the Earth warmer.
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Shut down the computer when we are through with it; put it ———— when we leave it for a while.
A lot of small problems can be solved by ____________ your computer.
When people———, they produce less trash and help save natural resources.
以下哪些变量名是合法的？
A. abe
B. _varExample
C. int
D. public
E. 78ab
F. int_var
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