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Increased temperature can speed up the maturing process.
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听力原文：M: Honey，the basketball game is about to start. And could you bring some chips and a bowl of ice cream？And…uh…a slice of pizza from the fridge.
W: Anything else？
M: Nope，that's all for now. Hey，honey，you know，they're organizing a company basketball team，and I'm thinking about joining. What do you think？
W: Humph.
M: “Humph”. What do you mean by“Humph”？I was the star player in high school.
W: Yeah，twenty-five years ago. Look，I just don't want you to have a heart attack running up and down the court.
M: So，what are you suggesting？Should I just abandon the idea？I'm not that out of shape.
W: Well…you ought to at least have a physical examination before you begin. I mean，it has been at least five years since you played at all.
M: Well，okay，but…
W: And you need to watch your diet and cut back on the fatty foods，like ice cream. And you should try eating more fresh fruits and vegetables.
M: Yeah，you're probably right.
W: And you should take up a little weight training to strengthen your muscles or perhaps try cycling to build up your cardiovascular system. Oh，and you need to go to bed early instead of watching TV half the night.
M: Hey，you're starting to sound like my personal fitness instructor!
W: No，I just love you，and I want you to be around for a long，long time.
(23)
A．She is worried her husband will spend too much time away from home．B．She is afraid h
听力原文： The United States operates under a federal system of government. Under the federal system，power is divided between the central government and the states. The central government is given specific powers. These powers are named in the Constitution. Powers that are not assigned to the central government in the Constitution belong to the states.
The central government can pass laws that affect trade between states. The central government can also make treaties with foreign countries. It has the power to print money. The Constitution gives the central government these powers. These powers belong to the central government only. However，the states have many powers that the central government cannot control. For example，a state is allowed to tax people who live and work in the state. The central government cannot put a limit on the amount of money that a state taxes its people.
Many people feel that the federal system has many good points. One good point is that it restrains the power of the central government. The central government cannot become too powerful. Another good point is that the central government makes sure that the bigger states don't become too powerful. Under the Constitution，all states are treated equally. The laws of the central government do not favor one state over another.
(30)
The Irish potato famine of 1845 brought ______ people to America.
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