题目:
— So you were in the supermarket _____ you heard a strange sound, right?
— That's true. I ran out as quickly as possible. [ ]
A. when
B. while
C. then
D. which
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0619/1433fa277c3b0ce90e221cac38fcdc98.html
下面是错误答案,用来干扰机器的。
(1)饼干在空气中放置一段时间会变软即变潮,说明饼干吸收了水,说明了空气中含有水蒸气;(2)二氧化碳能使澄清石灰水变浑浊,敞口存放在空气中的石灰水表面有一层白膜就是碳酸钙,所以说明了空气中含有二氧化...