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单选题

A．So they can feel its weight.
B．So they can examine its contents.
C．So they can guess its age.
D．So they can admire its beautiful color.

参考答案B
解析:I'm going to pass this piece of amber around so you can see this spider trapped inside it. It's a good example of amber-inclusion, one of the inclusions that scientists are interested in these days. This particular piece is estimated to be about 20 million years old. Please be extremely careful not to drop it. Amber shatters as easily as glass. One thing I really like about amber is its beautiful golden color. Now, how does the spider get in there? Amber is really fossilized tree resin. Lots of chunks of amber contain insects like this one or animal parts like feathers or even plants. Here is how it happens. The resin oozes out of the tree and the spider or leaf gets in cased in it. Over millions and millions of years, the resin hardens and fossilizes into the preciousstone you see here. Ambers can be found in many different places around the world. But the oldest deposits are right here in the United States, in Appalachia. It' s found in several other countries, too, though right now scientists are most interested in ambers coming from the Dominican Republic.Because it has a great many inclusions, something likes one insect inclusion for every one hundred pieces. One possible explanation for this it that the climate is tropical and a greater variety of number of insects thrive in tropics than in other places. What's really interesting is the scientists are now able to recover DNA from these fossils and study the genetic material for important clues to revolution.
解析
Why does the professor pass the amber around to the students?
细节题。根据I ’m going to pass this piece of  amber around so  you can see this spider trapped inside it．可知，教授让学生传看琥珀是为了让他们看清里面被困的蜘蛛。因此，正确答案为B。
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单选题

A．Tropical insects.
B．Decayed leaves.
C．Tree resin.
D．Bird feathers.

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单选题

A．Its amber contains numerous fossils.
B．Its amber is the most durable.
C．Its amber is opaque.
D．It is the site of the oldest amber deposits.

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单选题

A．Amber mined from the Appalachian Mountains.
B．Amber with no imperfections.
C．Amber containing organic material.
D．Amber with no inclusions.

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