[填空题]Mirages (海市蜃楼) are produced by refraction (折射) of light within a layer of air. This layer of air resists (1) up, even in a fairly strong wind.
Probably the most popular mirage picture is one of a lake in a (2) desert. There may even be the appearance of (3) breaking on the shore. The easiest form of mirage to study, however, is one that has been seen by millions of people-those seeming strips of water on asphalt-surfaced (柏油路面的) roads that disappear suddenly when one (4) them.
The scientist considers the long distance mirage as the most (5) of mirage forms, since it is against a basic law of physics. The law states that the apparent size of an (6) seems smaller as we move away from it; however, this kind of mirage will carry a (7) of a ship, a town, or an island a thousand miles and set it up in the sky as big as life.
Mirages may have had an (8) on hi

[填空题]Mirages (海市蜃楼) are produced by refraction (折射) of light within a layer of air. This layer of air resists (1) up, even in a fairly strong wind.
Probably the most popular mirage picture is one of a lake in a (2) desert. There may even be the appearance of (3) breaking on the shore. The easiest form of mirage to study, however, is one that has been seen by millions of people-those seeming strips of water on asphalt-surfaced (柏油路面的) roads that disappear suddenly when one (4) them.
The scientist considers the long distance mirage as the most (5) of mirage forms, since it is against a basic law of physics. The law states that the apparent size of an (6) seems smaller as we move away from it; however, this kind of mirage will carry a (7) of a ship, a town, or an island a thousand miles and set it up in the sky as big as life.
Mirages may have had an (8) on hi

[简答题]海市蜃楼又叫“蜃景”，是地球大气层中由于光的折射或全反射而出现的奇异幻影。在我国山东省的蓬莱县，当风和日丽之时，常常可以看见海面上有亭台楼阁出现，人们称为蓬莱仙境。其实，它们并不是神仙居住的宫室，而是地球大气层所变的光学魔术，把远处的景象搬到了这里。我们知道，水的比热比较大，在阳光照射下，海水温度湿度升高很少，接近海面的空气温度湿度也不高，所以密度就大；而海面上空的空气温度湿度容易升高，密度就小。从远处景物上射来的光线在经过密度相差很大的空气层时，发生显著的折射或全反射而进入我们的眼帘，于是幻影出现了。

[名词解释]折射声影

[单项选择]The chocolate were not produced
A. for more than ten years.
B. for less than ten years.
C. during the World War II.

[单项选择]海市蜃楼的形成原因是（）。
A. 沙漠中的人由于高温出现幻觉
B. 物体反射的光经过大气折射而形成的虚像
C. 地球的球面效应
D. 大气中水汽增加导致光线传播方向发生变化

[单项选择]

Researchers produced evidence to support what most of us already knew--that a cup of tea is the answer to any crisis.
Dr. Malcolm Cross, a psychologist at City University London, tested the anxiety levels of a group of people following a (41) situation and revealed that even a single cup of tea has a (42) calming effect. His team gave 42 volunteers a mental arithmetic exam and (43) offered half of them a cup of tea and the other half a glass of water. The water group’s anxiety levels soared (44) 25 percent compared to before the task, (45) the tea group actually reported a four percent reduction in anxiety---despite the difficult test, they were more relaxed than when they started.
According to a survey carried out for the research, 68 percent of Britons (46) tea in a dilemma, making it the nation’s most common response to trouble of (47) kind. About 60 percent said the promise of comfort a
A. whichever
B. whatever
C. however
D. whoever