单项选择题

It can be inferred that a condition that favors fossilization when volcanic ash falls to Earth is______.

A．quick burial.
B．cold storage.
C．quick temperature change.
D．lack of water
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单项选择题
The passage primarily concerns which of the following
A．Types of fossils found in different climates.
B．Some physical character of fossils.
C．Conditions favorable to the preservation of fossils.
D．How fossils are preserved.
单项选择题
The next part of the passage would most probably deal with ______.
A．Some information about the coppersmith.
B．The similarities and differences between coppersmith and silversmith.
C．Some other outcomes with the expanding of merchant class.
D．The disappear of traditional jobs as coppersmith and silversmith.
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