【名词&注释】
半导体(semiconductor)、金刚石(diamond)、导电性(conductivity)、导热性(thermal conductivity)、不同点(different grounds)、好莱坞(hollywood)、透光性(light transmittance)、课间休息(intermission)、鲜为人知(rarely known)、一气呵成
[单选题]下列实例中，材料的选用与描述的物理属性不相符的是（）
A. 热水壶的手柄用胶木制成，是因为胶木的导热性好
B. 划玻璃的刀头镶嵌有金刚石，是因为金刚石的硬度大
C. 输电导线的内芯用铜制成，是因为铜的导电性好
D. 房屋的天窗用玻璃制成，是因为玻璃的透光性(light transmittance)好
查看答案&解析
举一反三：
[单选题]19．
A. Her
B. His
C. She
D. He
[单选题]23． Which of the following seems to be a threat(威胁) to Hollywood?
A. The use of modern cameras and other equipment．
B. The interest of middle-aged filnl stars．
C. The making of TV series like Dynasty，
D. The expensively made copies of scenes，
[单选题]BRadio and television are very popular in the world today． Millions of people watch TV．Perhaps more people listen to the radio．The TV is，of course，more useful than the radio． On TV you can see and hear what is hap-pening in the world．Now radio is still with us． And the number of listeners is becoming larger． One reason for this is the invention of the transistor(半导体) radio． A transistor radio is sometimes very small． It is very easy to carry． You can put one in your pocket and listen to it on the bus or on your bike when you go to work． It is better．for blind people． The sight(视力J) of many old peo-ple is not good enough to watch TV． Then，when people are working，they can't watch TV， but they can listen to music or news over the radio． What-s more，radio is much cheaper than TV．
A. Radio and television__________ in the modern world today
C. are both widely used
D. are both expensive
E. have been changed a lot
F. are used for learning things
[单选题]_____________( )53.
A. and
B. the
C. /
D. to
[单选题]44．
A. schools
B. classes
C. meals
D. students
[单选题]下列词语中加点字的注音、字形完全正确的一项是（ ）
A. 震撼（hàn） 匿笑（nì） 鲜为人知(rarely known)（xiān）
B. 怡悦（yi） 广漠（mò） 一气呵成（hē）
C. 亢奋（kàng） 蹒跚（mǎn） 沧海桑田（cānɡ）
D. 烦燥（zào） 干涸（hé） 相形见绌（chù）
[单选题]___________
A. but
B. so
C. or
D. while
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