56. All the following words can be used to describe the woman except ________.

　　A. poor

　　B. silent

　　C. cold

　　D. shy

　　57. The underlined word “establish” in the fourth paragraph probably has the same meaning as ________.

　　A. set up

　　B. add up

　　C. pack up

　　D. come up

　　58. Why did the woman usually keep silence while taking the bus?

　　A. She was worried about her disabled son.

　　B. She had difficulty in expressing herself.

　　C. She was sad to see the happy Mexican couple as a single mother.

　　D. She was only interested in the bus driver.

　　59. Which of the following might be the best title of this passage?

　　A. The Silent Woman on the Bus

　　B. Friends on the Road

　　C. Going to Work by Bus

　　D. Different Kinds of Friendship

　　B

　　Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

　　“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”

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