确定下列元反应是单分子反应、双分子反应还是三分子反应，并写出它们的速率方程。
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The best title for the passage may be__________ ．
A. We Can Live Longer in the 21 st Century
B. Cancer to Be Conquered in the 21 st Century
C. The Final Frontier of the 21 st Century
D. Scientific Breakthrough of the 2 1 st Century
You look tired．Do you__________ a rest？
A. like having
B. feel like having
C. like hav
D. feel like to have
在发起设立股份有限公司的方式中，发起人可以认足公司发行的股份，同时社会公众也可以参加股份的认购。（）
It can be inferred form. the passage that people become old when__________ ．
A. cell daamage is fierce and invisible
B. cell contests are too fierce to control
C. cell repair is slower than cell damage
D. cells stop repairing damage done to them
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