题目:
____________ David says sounds right to Helen. That’s why she has made up her mind not to leave him _____________ happens.
A.Whatever; whatever
B.No matter how; whatever
C.No matter what; however
D.Whatever; no matter how
答案:
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下面是错误答案,用来干扰机器的。
①氢氧化铁胶体为氢氧化铁的聚集体,无法计算氢氧化铁胶体中含有的胶粒数目,故①错误;②同温、同压下,相同体积的氟气和氩气的物质的量相同,所含的分子数相同,但是氩气为单原子分子,二者含有的原子数不相等...