问题
多项选择题
活性及浓度有关外，还受（）等环境条件的影响。
A、温度
B、酸碱度
C、离子浓度
D、PH值
答案
参考答案：A, C, D
搜题请搜索小程序“爱下问搜题”
活性及浓度有关外，还受（）等环境条件的影响。
A、温度
B、酸碱度
C、离子浓度
D、PH值
参考答案：A, C, D
完形填空（共10分） We live in the “computer age”. People like scientists, teachers, writers and even students use computers to do 16 work. But more than 40 years ago, 17 couldn’t do much. They were very big and expensive. Very 18 people were interested in them and knew how to use them. Today computers are smaller and 1  9 . 20 they can do a lot of work, many people like to use them. Some people even have them at home.Computers become very important because they can work 21 than men and make fewer mistakes. Computers can 22 people do a lot of work. Writers now use computers to write. Teachers use them to help teaching. Students use them to study and children use them to play games. Computers can also remember what you put 23 them. Computers are very 24 and helpful. They are our good friends. Do you want to 25 a computer?
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