答案：　C

　　．解析：　考查细节理解。根据第一段中的“But new research shows that the brain is more like a muscle—it changes and gets stronger when you use it.”可知答案。

　　答案：　A

　　．解析：　考查段落大意。本段详细描述了大脑如何通过练习和学习新事物而发生变化，从而变得更敏捷。

　　答案：　 D

　　．解析：　考查词义猜测。根据破折号后面的“they were better at sloving problems and learning new things”可知，该词应为“敏锐的”之意。

　　答案：　B

　　．解析：　考查推理判断。最后一段提出科学家是从研究动物的大脑得出的结论，因此下一段最可能进一步描述这些研究成果。

　　答案：CA,B,C或D四个选项中，选出最佳选项。

　　We once had a poster competition in our fifth grade art class.

　　“You could win prizes, “ our teacher told us as she wrote the poster information on the blackboard. She passed out sheets of construction paper while continuing, “The first prize is ten dollars. You just have to make sure that the words on the blackboard appear somewhere on your poster. “

　　We studied the board critically. Some of us looked with one eye and held up certain colors against the blackboard, rocking the sheets to the right or left while weconjured up our designs. Others twisted their hair around their fingers or chewed their erasers while deep in thought. We had plans for that ten-dollar grand prize, each and every one of us. I’m going to spend mine on candies, one hopeful would announce, while another practiced looking serious, wise and rich.

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