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<TD class=l17><FONT class=f14 id=zoom><BR>Question 45-50<SPAN
style="mso-spacerun: yes"><BR> </SPAN>Bloodhounds are
biologically adapted to trailing their <BR>prey. The process by
which the nose recognizes an odor is not <BR>fully understood, but
there are apparently specific receptor <BR>sites for specific odors.
In one explanation, recognition occurs <BR>when a scent molecule
fits into its corresponding receptor site, <BR>like a key into a
lock, causing a mechanical or chemical change <BR>in the cell.
Bloodhounds apparently have denser concentrations <BR>of receptor
sites tuned to human scents.<SPAN
style="mso-spacerun: yes"><BR> </SPAN>When a bloodhound trails
a human being, what does it <BR>actually smell? The human body,
which consists of about 60 <BR>trillion living cells, sheds exposed
skin at a rate of 50 million <BR>cells a day. So even a trail that
has been dispersed by breezes <BR>may still seem rich to a
bloodhound. The body also produces <BR>about 31 to 50 ounces of
sweat a day. Neither this fluid nor <BR>the shed skin cells have
much odor by themselves, but the <BR>bacteria working on both
substances is another matter. One <BR>microbiologist estimates the
resident bacteria population of a <BR>clean square centimeter of
skin on the human shoulder at <BR>"multiples of a million." As they
go about their daily business <BR>breaking down lipids, or fatty
substances, on the skin, these <BR>bacteria release volatile
substances that usually strike the <BR>bloodhound's nose as an
entire constellation of distinctive <BR>scents.<BR>45.What does the
passage mainly discuss?<BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>Why people choose bloodhounds
for household pets<BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>How a bloodhound's sense of
smell works<BR>(C)<SPAN style="mso-tab-count: 1"> </SPAN>How
humans compensate for an underdeveloped sense of smell<BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>The way in which bacteria work on
skin cells and body sweat.<BR>46.The author compares a scent
molecule with a <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>key<BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>lock<BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>cell<BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>bloodhound<BR>47.In line 9, the
word "it" refers to <BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>bloodhound<BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>human being<BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>smell<BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>body<BR>48.According to the
passage, how many cells of skin does the human body rid itself of
every day?<BR>(A)<SPAN style="mso-tab-count: 1"> </SPAN>60
trillion<BR>(B)<SPAN style="mso-tab-count: 1"> </SPAN>50
million<BR>(C)<SPAN style="mso-tab-count: 1"> </SPAN>1
million<BR>(D)<SPAN style="mso-tab-count: 1"> </SPAN>Between 31 and
50<BR>49.In line 13, the word "rich" is used to mean that a trail
is<BR>(A)<SPAN style="mso-tab-count: 1"> </SPAN>paved with
precious materials<BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>a profitable business to get
into<BR>(C)<SPAN style="mso-tab-count: 1"> </SPAN>a very costly
undertaking<BR>(D)<SPAN style="mso-tab-count: 1"> </SPAN>filled with
an abundance of clues.<BR>50.Which of the following acts as a
stimulus in the production of the human scent?<BR>(A)<SPAN
style="mso-tab-count: 1"> </SPAN>Sweat<BR>(B)<SPAN
style="mso-tab-count: 1"> </SPAN>Dead skin cells<BR>(C)<SPAN
style="mso-tab-count: 1"> </SPAN>Bacteria<BR>(D)<SPAN
style="mso-tab-count: 1"> </SPAN>Fatty substances.<?XML:NAMESPACE
PREFIX = O /><O:P> </O:P></SPAN>
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