火山喷发破坏地理环境，影响经济活动。然而，对人类也带来有利的方面。列举两点。
在家庭中用鲜葡萄制作果酒时，正确的操作是
有关气雾剂的叙述中错误的是（ ）。
a friend is somecone you can share your secrets. If you 77. ____________
We can learn from the text that Fitzsimons’s invention .
把文中画横线的句子翻译成现代汉语.(10分)
Owen wouldn’t eat anything ____________ he cooked it himself
Cindy shut the door heavily and burst into tears. No one in the office knew shewas so angry.
细菌聚集成两堆的主要原因是什么？
A. how B. where C. what D. when
We can know that before 1995 Mary 。
Which of the following would be the best title for the text
18-3．分子式为C5H10O2的酯共有(不考虑立体异构) ：
The information passed on by word of mouth is important because____.
乳剂型气雾剂的组成部分不包括以下内容（ ）。