6．一列简谐波沿x轴正方向传播，某时刻波形图如图甲所示，a、b、c、d是波传播方向上的四个振动质点的平衡位置．如再过个周期，其中某质点继续振动的图象如图乙所示，则该质点是(　　 )

　　　 A．a处质点 　　　　　

B．b处质点

　　　 C．c处质点 　　　　　

D．d处质点

5．太赫兹辐射是指频率从0．3THz(1THz=10¹²Hz)，波长介于无线电波中的毫米波与红外线之间的电磁辐射，辐射所产生的T射线在物体成像、医疗诊断、环境检测、通讯等方面具有广阔的应用前景．最近，科学家终于研制出以红外线激光器为基础的首台可产生4．4THz的T射线激光器，从而使T射线的有效利用成为现实．关于4．4THz的T射线下列说法中正确的是(　　 )

　　　 A．它的波长比可见光短

　　　 B．它是原子内层电子受激发产生的

　　　 C．与红外线相比，T射线更容易发生衍射现象

　　　 D．与X射线相比，T射线更容易表现出粒子性

4．如图所示，一个透明玻璃球的折射率为，一束足够强的细光束在过球心的平面内，以45°入射角由真空射入玻璃球后，在玻璃球与真空的交界面处发生多次反射和折射，从各个方向观察玻璃球，能看到从玻璃球内射出的光线的条数是 (　　 )

A．2　　 B．3 　　　 C．4　　 D．5

3．如图所示是一列简谐横波某时刻的图象．经过时间，恰好第三次重复出现图示的波形．根据以上信息，能确定下面的哪项？(　　 )

　　　 A．波的传播速度的大小

　　　 B．时间内质元P经过的路程

　　　 C．时刻质元P的速度方向　

　　　 D．时刻的波形

2．如图所示，两根完全相同的弹簧和一根张紧的细线将甲、乙两物块束缚在光滑水平面上，已知甲的质量大于乙的质量．当细线突然断开后，两物块都做简谐运动，在运动过程中(　 　)

A．甲的振幅大于乙的振幅　　　　　　　

B．甲的振幅小于乙的振幅

　　　 C．甲的最大速度小于乙的最大速度

　　　 D．甲的最大速度大于乙的最大速度

1．下列关于电磁波的说法中正确的是(　　 )

　　　 A．麦克斯韦电磁场理论预言了电磁波的存在　

B．电磁波从真空传入水中，波长将变长

　　　 C．雷达可以利用自身发射电磁波的反射波来对目标进行定位

　　　 D．医院中用于检查病情的“B超”利用了电磁波的反射原理

第三节 书面表达(满分25分)

　 目前， 很多学校禁止学生春游。 最近你班针对这一现象进行了讨论。请你根据下列表格内容提示，用英语写一篇短文，介绍讨论情况，并发表自己的见解。

注意：1. 开头已给出，但不计入总词数；

2. 词数：120左右；

3. 参考词汇：知识面scope of knowledge

　　 Recently our class have had a heated discussion on whether students should b allowed to go for a spring outing…

第一节 根据短文内容填空(每空不超过3个单词，共10小题，满分10分)

The Spring Festival in China

Every year there is a Spring Festival in China. Usually it is held in January or February. Of all our festivals, the Spring Festival is the most important. So before it comes, everyone has to decorate them. The old folk says that everything must be new and clean for the Spring Festival celebrations so that the new year will bring happiness and good luck. We also buy pork, beef, chicken, fruit and many other things. Parents buy new clothes for their children and children may also buy presents for their parents.

The celebration begins on the eve of the lunar new year, and we put up some New year pictures. On the Festival eve, all the family members come back to their hometown. No matter how far away from home a person is, he will always try to get home in time for this big dinner. We often make a special kind of food called “dumplings”. It means “come together”. When we’re enjoying the meal, we give each other the best wishes for the coming year. We sing, dance and play cards.

On the first day of the holiday, we usually stay at home. We get up fairly early and, first thing, exchange New Year greetings. This is a happy moment for the children; they can et some pocket money. And then we shot off firecrackers and fireworks. We enjoy ourselves very much.

　On the second and the third days, we go visiting relatives and friends. We sit around chatting and eating sweets and New Year Cakes and all kinds of delicacies. Each family prepares something special. Sometimes we would see some lion and dragon dancing.

The celebration lasts about 15 days. The 15th night of the first moon in called the Lantern Festival. This is the day when we young people go out to enjoy ourselves, and sometimes we dance folk dances far into the night.

The Spring Festival in China