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According to the professor, what characteristic of Earth's moon should a theory of its origin be able to explain？
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听力原文： The infant mortality rate in China has declined notably since the beginning of the 1990s, according to China's new white paper on children's conditions. The average decrease in infant mortality in the country is 6. 5 percent a year since 1990. The mortality rate of children under five years old has been tailing off by 5.85 percent annually, the white paper says.
The white paper, entitled "The Situation of Children in China" and issued by the Information Office of the State Council says that so far, no other country in the world with an annual per capita income approximate to China's has attained such rapid decreases.
The percentage of the annual decrease in infant mortality rate since 1990 is ______.
What can be inferred about the including Maine and Quebec during the early 1800s？
Why is the second theory sometimes referred to as the Mars Theory？
听力原文：W: Jackson, I heard that everything went on well with you several years ago...
M: Do let me forget it. At that time I had a wonderful life and was on top of the world. I don't know what drove me to seek diversion in poker machines. So pretty soon I was going to play the pokies quite often and yes I was enjoying myself and sometimes even won a few dollars.
W: Is the game so attractive？
M: You never know. It has a kind of magic. I was totally consumed. Anyway the whole story is long and covers the last seven years and though I have tried to be unemotional. I must say now that I have been through hell and I've felt as if I was already dead.
W: For so long a time, haven't you ever thought to wash your hands？
M: When I am gambling, I don't care about anything else. I know 1 was addicted and powerless to stop. I've lost much. Even so all I can dream of is the big win.
W: Several years has passed, tell us what your feeling is now？
M: I end up just as bad, and hate myself. My health suffered, my finance was in ruin, and I didn't have the will- power to stop. I have been homeless many times and my life has become unmanageable.
W: That's a crying shame. It's high time you turned over a new leaf. Wish you success.
Which one of the following was NOT among the conditions of the man several years ago？
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