【单选题】I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the empty space in front of her as though using Mace against an imaginary as...
A.
We don't need to worry too much about bacteria everywhere in our life.
B.
Antibacterial products for the home are found to be effective.
C.
The TV advertisement the writer mentioned is a total failure.
D.
The existent bacteria pose a threat only to the very young and very old.
【简答题】A few years ago, when I was about 14,I went out for a walk 31 a rainy summer day. I saw a man 32 small, dirty colthes. He had 33 umbrella, and he was picking bottles out of bushes. When he found 34 ,h...
【判断题】在静止流体中,当质量力只有重力作用时,等压面是一个水平面。
【判断题】在静止流体中,当质量力只有重力作用时,等压面是一个水平面。