碱度具有缓冲能力主要在于水中存在的各种碳酸化合物，除了重碳酸根离子 HC03-和碳酸根离子 C032-以外，还应包括( )。
A. 溶解的气体 C02
B. 未电离的 H2C03
CaC03
D. OH-
1.For college students, the most important thing about finding a summer job____.
A. is to be armed with a well-written resume
B. is not the job itself but the money to make
C. is to know the importance of independence
D. is a chance to get working experience
2.What is the author mainly trying to say to college students?
A. Not to take the summer job seriously.
B. To keep next semester in mind.
C. To take a short-term view on summer jobs.
D. Not just simply to find a summer job.
3.The piece of advice from the author is______.
A. to look for a serious romantic partner
B. to pursue a well-directed career
C. to have start-up capital(启动资金)
D. to have a good credit score
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