2. 医学
  3. A、6.5. B、5.85. C、5 D、19 A从“The average decrease is 6．5 percent a year since 1 990．”可推知。

A、6.5. B、5.85. C、5 D、19 A从“The average decrease is 6．5 percent a year since 1 990．”可推知。

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问题  
M: Sorry to be calling you so late but I’m having trouble with the math assignment. And I am sick of doing it alone.
W: Oh, .. .well, do you want to come over? But I do have to say that I’m still not halfway through it.
Q: How does the woman respond to the man’s problem?
W: Anything new in today’s paper?
M: Yes. The infant mortality rate in China has declined notably since the beginning of the 1990s. The average decrease 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.
Q: What is the percentage of the annual decrease in the infant mortality rate since 1990?
选项 A、6.5.
B、5.85.
C、5
D、19
答案A
解析 从“The average decrease is 6．5 percent a year since 1 990．”可推知。
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