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<TD class=l17><FONT class=f14 id=zoom> <BR>Question
31-38<O:P> <SPAN style="mso-spacerun: yes"><BR>
</SPAN>The ability of falling cats to right themselves in
midair <BR>and land on their feet has been a source of wonder
for ages. <BR>Biologists long regarded it as an example of
adaptation by <BR>natural selection, but for physicists it
bordered on the miraculous. <BR>Newton's laws of motion assume
that the total amount of spin <BR>of a body cannot change
unless an external torque speeds it up <BR>or slows it down. If
a cat has no spin when it is released and <BR>experiences no
external torque, it ought not to be able to twist <BR>around as
it falls.<O:P> <SPAN style="mso-spacerun: yes"><BR>
</SPAN>In the speed of its execution, the righting of a
tumbling <BR>cat resembles a magician's trick. The gyrations of
the cat in <BR>midair are too fast for the human eye to follow,
so the process <BR>is obscured. Either the eye must be speeded
up, or the cat's <BR>fall slowed down for the phenomenon to be
observed. A century <BR>ago the former was accomplished by
means of high-speed <BR>photography using equipment now
available in any pharmacy. <BR>But in the nineteenth century
the capture on film of a falling <BR>cat constituted a
scientific experiment.<O:P> <SPAN
style="mso-spacerun: yes"><BR> </SPAN>The experiment was
described in a paper presented to the <BR>Paris Academy in
1894. Two sequences of twenty photographs <BR>each, one from
the side and one from behind, show a <BR>white cat in the act
of righting itself. Grainy and quaint <BR>though they are, the
photos show that the cat was dropped <BR>upside down, with no
initial spin, and still landed on its feet<BR>Careful analysis of
the photos reveals the secret. As the cat<BR>rotates the front of
its body clockwise, the rear and tail
twist <BR>counterclockwise, so that the total spin remains
zero, in perfect <BR>accord with Newton's laws. Halfway down,
the cat <BR>pulls in its legs before reversing its twist and
then extends <BR>them again, with the desired end result. The
explanation was <BR>that while no body can acquire spin without
torque, a flexible <BR>one can readily change its orientation,
or phase. Cats know <BR>this instinctively, but scientists
could not be sure how it <BR>happened until they increased the
speed of their perceptions a <BR>thousandfold.<O:P>
<BR>31.What does the passage mainly discuss?<O:P>
<BR>(A)<SPAN style="mso-tab-count: 1"> </SPAN>The
explanation of an interesting phenomenon<O:P> <BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>Miracles in modern
science<O:P> <BR>(C)<SPAN style="mso-tab-count: 1">
</SPAN>Procedures in scientific investigation<O:P>
<BR>(D)<SPAN style="mso-tab-count: 1"> </SPAN>The
differences between biology and physics.<O:P> <BR>32.The word
"process" in line 10 refers to<O:P> <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>the righting of a tumbling
cat<O:P> <BR>(B)<SPAN style="mso-tab-count: 1">
</SPAN>the cat's fall slowed down<O:P> <BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>high-speed photography<O:P>
<BR>(D)<SPAN style="mso-tab-count: 1"> </SPAN>a
scientific experiment<O:P> <BR>33.Why are the photographs
mentioned in line 16 referred to as an "experiment"?<O:P>
<BR>(A)<SPAN style="mso-tab-count: 1"> </SPAN>The
photographs were not very clear.<O:P> <BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>The purpose of the
photographs was to explain the process.<O:P> <BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>The photographer used
inferior equipment<O:P> <BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>The photographer thought the
cat might be injured.<O:P> <BR>34.Which of the following can
be inferred about high-speed photography in the late 1800's?<O:P>
<BR>(A)<SPAN style="mso-tab-count: 1"> </SPAN>It was a
relatively new technology.<O:P> <BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>The necessary equipment was
easy to obtain.<O:P> <BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>The resulting photographs are
difficult to interpret.<O:P> <BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>It was not fast enough to
provide new information.<O:P> <BR>35.The word "rotates" in
line 19 is closest in meaning to<O:P> <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>drops<O:P> <BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>turns<O:P> <BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>controls<O:P>
<BR>(D)<SPAN style="mso-tab-count: 1"> </SPAN>touches<O:P>
<BR>36.According to the passage, a cat is able to right itself
in midair because it is <O:P> <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>frightened<O:P>
<BR>(B)<SPAN style="mso-tab-count: 1"> </SPAN>small<O:P>
<BR>(C)<SPAN style="mso-tab-count: 1">
</SPAN>intelligent<O:P> <BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>flexible<O:P>
<BR>37.The word "readily" in line 24 is closest in meaning
to<O:P> <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>only<O:P> <BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>easily<O:P> <BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>slowly<O:P> <BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>certainly<O:P> <BR>38.How did
scientists increase "the speed of their perceptions a thousandfold"
(lines 25-26)?<O:P> <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>By analyzing photographs<O:P>
<BR>(B)<SPAN style="mso-tab-count: 1"> </SPAN>By
observing a white cat in a dark room<O:P> <BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>By dropping a cat from a
greater height.<O:P> <BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>By studying Newton's laws of
motion.<O:P> <BR></FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
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