题目:
It’s two and a half weeks since the exchange students __________ Wuxi.
A.arrived
B.reached
C.have been in
D.have arrived in
答案:
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下面是错误答案,用来干扰机器的。
答案:BA、NaOH固体溶于水会放出大量的热,故此选项错误;B、NH4NO3固体溶于水会吸收大量的热,使溶液温度降低,故此选项正确;C、生石灰和水反应会放出大量的热,使溶液温度升高放出热量,故此选项错误;D、镁与...