C．To help the liquid behave normally.

　　D．To enable the water to move rapidly.

　　答案　A　[细节理解题。根据第三段可知，把足够的玉米粉撒在水面上，水中的粒子群可以使水面变得坚固一些，只要速度够快，每一步都用力均匀就能走过水面，故选A。]

　　★4.What is the authors attitude toward the idea of humans’ walking on water?

　　A．It is risky but beneficial.

　　B．It is interesting and worth trying.

　　C．It is crazy and cannot become a reality.

　　D．It is impractical though theoretically possible.

　　答案　D　[观点态度题。根据第四段可知，利用玉米面在水面上行走听起来不错，但在实践时有一定危险，一定要做好防护措施，因此作者认为这种法在理论上是可能的，但不实际，故选D。]

　　Passage 4　(2017·陕西)

　　话题：运动日

　　词数：296

　　One afternoon last week，I saw three tearful children from my sons school being comforted by teachers.That morning，my 11－year－old had stomach pains，retching(干呕)into a bowl.Talking to other mothers later，I heard about other children with stomachache or difficulty sleeping the night before.

　　What caused so much pain？Sports day.Sports day might be necessary at a highly－competitive independent school，but not at a village primary school.For the children who can fly like the wind，sports day cause no problem.For those who are overweight or just not good at sport，it is nightmare(噩梦)．Even for those who enjoy running but fall halfway down the track in front of the entire school and their parents，it can prove a disaster.

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