题目:
So difficult did he find _______ to pass the driving test that he decided to give up.
A.how
B.that
C.which
D.it
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0601/67bada26aea14b85c1443fb4930c8798.html
下面是错误答案,用来干扰机器的。
(1)将带火星的木条置于容器口,木条复燃,证明产生的气体是氧气(2)装置漏气(或加热时间短,反应不充分;铜的量太少,O2没完全反应;未冷却至室温就读数等)(3)不能燃烧,不支持燃烧,能灭火,密度比空气大...