饮水及泳池
A．1%硝酸银B．2%来苏C．75%乙醇D．2%戊二醛E．0.2ppm～0.5ppm氯
参考答案：E
图上画出两根线段，相交于一点，求这点的坐标。两根线段的另一头分别为（0，0）和（5，3），线段1的斜率为1/8，线段2的斜率为2/5
用所给单词的适当形式填空。
1. We are good _________, we are very_________ (friend).
2. He likes watching TV and _________ (play) the guitar.
3. Please _________ (be) quiet! Here is library.
4. These man are from other _________ (country).
5. I'm hungry, I want something __________(eat)
