【名词&注释】
蛋白质(protein)、化学家(chemist)、液化气泄漏
[单选题]学习化学的目的并不在于要成为化学家，重要的是善于用化学知识去分析、解决生产生活中的问题。从化学的角度看，下列说法中正确的是
A. 夜晚发现液化气泄漏立即开灯检查
B. 人们每天的饮食中都应有蔬菜、水果，其目的是补充蛋白质
C. 扑灭电器、图书档案等火灾最适宜的灭火器是液态二氧化碳灭火器
D. 炒菜时油锅着火，可立即加水灭火
查看答案&解析
点击获取本科目所有试题
举一反三：
[单选题]Dannydidallkindsofthingstomakethebaby______.
A. tostopcrying
B. stopcrying
C. tostoptocry
D. stoptocry
[单选题]24． The sentence "Your answers are welcome． " means " ________ "．
A. You are welcome to discuss the questions with us
B. We’ve got no idea， so your answers are welcome
C. Your answers are always right
D. You can give us all the right answers
[单选题]BThe world is not only hungry，it is also thirsty for water． this may seem strange to you，since nearly 75% of the earth is covered with water． But about 97% of this water is sea water．Man can only drink and use the other 3% fresh water that comes from rivers，lakes，under-ground and other places． And we cannot even use all of that，because some of this fresh water has been made dirty．
A. However，our need for water is getting greater and greater． Only if we take steps to solve this problem now，we can get away from a serious world water shortage later on． The people of the world cannot have an enjoyable life without enough clean water．
C. lf we can make it clean again，it can be used once more just as if it were fresh from a spring．
D. Where．could we turn to next for water? To the ocean! How can we do to make use of this great a-mount of sea water? We can take the salt from the water to make it fresh．
E. So if we take all these steps，we'll be in no danger of drying up!
F. Why does the writer say that the world is thirsty for water?
G. The amount of fresh water is really very small．
H. The people of the world waste too much water．
I. The people of the world have to drink a lot of water every day．
J. There are too many people in the world needing water．
本文链接：https://www.zhukaozhuanjia.com/download/4jooqj.html
