Please make sure to turn__________the gas when you finish cooking.
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All the parents are happy that the school ___________ its students with a free lunch.
A. provieds
B. masters
C. figures
D. teaches
某自发过程的逆过程是不能自动进行的
A. 对
B. 错
当橘子产地受灾时,如果对橘子的需求越缺乏弹性,那么对橘子的价格的影响也就越大,这是为什么?