题目内容
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.
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The Irish potato famine of 1845 brought ______ people to America.
A．They ignore them.B．They are afraid of them.C．They accept and enjoy them.D．They are i
M: I am afraid I just run out of the film.
Q: What do we learn from the conversation？
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Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
We may all like to consider ourselves free spirits. But a study of the traces left by 50,000 cellphone users over three months has conclusively proved that the truth is otherwise.
"We are all in one way or another boring," says Alhert-László Barabási at the Center for Complex Network Research at Northeastern University in Boston, who co-wrote the study. "Spontaneous individuals are largely absent from the population."
Barabási and colleagues used three months' worth of data from a cellphone network to track the cellphone towers each person's phone connected to each hour of the day, revealing their approximate location. They conclude that regardless of whether a person typically remains close to home or roams far and wide, their movements are theoretically predictable as much as 93 per cent of the time.
Surprisingly, the cellphone data showed that individuals'movements were more or less as predictable at week ends as on weekdays, suggesting that routine is rooted in human nature rather than being an effect of work patterns.
The cellphone records were processed to identify the most visited locations for each user. Then the probability of finding a given user at his or her most visited locations at each hour through the day was calculated.
People were to be found in their most visited location for any given hour 70 per cent of the time. Not surprisingly, the figure increased at night, and decreased at lunchtime and in the early evening, when most people were returning home from work.
The team analysed the randomness(随意的) of people's traces to show it was theoretically possible to predict the average person's whereabouts as much as 93 per cent of the time.
"Say your routine movement is from home to the coffee shop to work: if you are at home and then go to the coffee shop it's easy for me to predict that you are going to work," says co-author Nicholas Blumm.
This predictability was not much affected by differences in age, gender, language spoken or whether a person lived in a rural or urban setting.
The "spontaneous individuals" are most probably people who______.
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