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What does the woman think of grandmother？
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仙人掌原产于美洲，其中一种作为篱笆被引入澳大利亚。到1880年仙人掌生长茂盛，植株高大，面积迅速扩充，行人难以通行。这是生态入侵的表现。()
听力原文：The FAA would like to increase the mandatory retirement age for pilots. Now the retirement age for commercial pilots in the US is 60. To match international standards, the proposed change would hike that to 65.65 is the international age limit for commercial pilots.
The retirement age for commercial pilots in the US is 50.
听力原文：W: Hi! Did you watch that documentary on TV last night？
M: No, I was in a meeting, and unable to go home early. What was it about？
W: It was about insects.
M: Insects？
W: Yes. Do you know？ They are the most successful creatures on the earth.
M: What, more successful than humans？
W: Yeah. Because they were around long before people were, and there are far more insects than there are humans. What’s more, they are reproducing all the time.
M: Well, I suppose that’s true.
W: And they are incredibly adaptable.
M: In what way？
W: Well, take mosquitoes for example. You know, the things that spread the disease. What troubles us is that every time we try to wipe out the mosquitoes with some new insecticide, they change their body chemistry.
M: Haven’t they just brought out a new medicine to fight the disease？
W: Yes, they have. But I bet that within five years they’ll be looking for a new one! The mosquitoes will simply adapt again!
M: I think it keeps scientists employed!
W: I guess so.
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