Are you preparing for a big test? If so, you may want to go play some basketball in 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（管）, including those in the brain, stronger and more fully developed. Dr. Cameron claims this allows people who exercise to concentrate better. As she says, "While we already know that exercise is good for the heart, exercise can really 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. With babies, even a little movement can show big results. Margaret Barnes, a pediatrician（儿科医生）, believes in the importance of exercise. She thinks that many learning disabilities that children have in elementary school or high school can be traced back to（可追溯到） a lack of movement as babies. "Babies need movement that stimulates their five senses（感官）. They need to establish a connection between motion（动作）and memory. In this way, as they get older, children will begin to associate（联系） physical activity with higher learning," says Margaret.

Older people can beef up（加强） their brains as well. Columbia University studied a group of seniors ranging in age from（从...排列到） seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week. The exercise does not have to be very difficult, but it does have to increase the heart rate. Also, just like the motion for infants（婴儿）, exercise for older people should involve some complexity. Learning some new skills or motions, such as with yoga or tai-chi, helps to open up memory paths in the brain that may not have been used for a long time.

For most people, any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood. And your brain can benefit from as little as two to three hours of exercise a week.

1．What is the main idea of this reading?

A．How to exercise                                  B．How exercise helps the brain

C．How to get good scores on a test          D．How the brain can change

2．According to the reading, what is the connection between exercise and brain development?

  A．Exercise makes us stupid．                  B．The brain needs special mental exercise.

  C．The more exercise, the bigger the brain  D．Physical exercise helps us think better.

3．The minimum（最小）amount of exercise required to gain any benefit is.

A．three hours per week                          B．40 hours per week 

C．three hours per day                             D．40 hours per month

4．Why is yoga recommended for seniors?

A．It is easy on joints.                               B．It can be done in groups.

C．It does not increase the heart rate.         D．It includes learning new motions.

翻译：根据所给汉语句子意思, 完成下列句子

76. 每次我一张口, 就会讲错话。

   _________ _________ I open my mouth, I put my foot in it.

77. 设想这样一种情景, 双方都认识的人离开了房间, 两个陌生人开始交谈。

  _________ a situation _________ two strangers are talking to each other after someone they both know has left the room.

78. 老师讲英式英语还是讲美式英语没有太大的差别。

  _________ doesn't make much of a _________ whether a teacher speaks British or American English.

79. 他开着一卡车香蕉, 突然就在转弯处掉下路面。

  He was _________ a lorry load of bananas _________ he came off the road.

80. 对于从事这项工作的人来说, 拥有常识、健康的身体以及外向的个性可能比掌握计算机技能更重要。

  For people doing this job, common sense, physical fitness and an outgoing _________ are _________ to be more important than computer skills.

81. 他身无分文地来到新奥尔良的时候, 却发现那里没有开往南美洲的船了。

  He arrived in New Orleans without a penny in his pocket only _________ _________ that there were no boats for South America.

82. 面具的使用受到了法律条文的限制, 这最早可以追溯到14世纪。

  Their use was limited by laws, the first of _________ _________ back to the 14th century.

83. 如果你走进任何一个地方的中学或大学校园, 你很有可能看到身着印有那个熟悉标志的李宁运动服的学生们。

  If you go into a school of university anywhere, the _________ are that you will see students _________Li Ning tracksuits with the familiar logo.

84. 马拉松是奥运会的最后一项赛事, 因为它被认为是最艰难的项目。

  The marathon is the final Olympic event because it is _________ _________ be the hardest.

85. 如今, 政府似乎正在赢得这场战争。

  Today, the government seems to _________ _________ the battle.

   76._________ _________       77. _________ _________    78. _________ _________   

   79. _________ _________     80. _________ _________    81. _________ _________  

   82. _________ _________      83. _________ _________    84. _________ _________  

   85. _________ _________