A．the three times weight of

　　B．three times the weight of

　　C．as three times heavy as

　　D．three times as heavier as

　　解析：考查倍数表达。倍数＋as＋形容词或副词原级＋as...；倍数＋the ＋名词(size，length，width...)＋of...。

　　答案：B

　　Ⅱ.阅读理解

　　Are you preparing for a big test？If so，you may want to play some basketball between hitting the books.

　　Doctors are starting to find more and more information

　　that suggests a connection between exercise and brain

　　development.Judy Cameron，a scientist at Oregon Health and Science University，studies brain development.According to her research，it seems that exercise can make blood vessels(血管)，including those in the brain，stronger and more fully developed.Dr.Cameron is sure that this allows people who exercise to think better.As she says，“While we already know that exercise is good for the heart，exercise can actually cause physical changes in the brain.”

　　The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.Even a little movement can show big results.Margaret Barnes，a scientist，also believes in the importance of exercise.She thinks that many learning disabilities that children have in primary school or high school can result from a lack of movement as babies.“Babies need movement that encourages and excites their five senses.They need to set up a connection between motion(运动)and memory.In this way，as they get older，children will begin to connect physical activity with higher learning.”says Margaret.

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