Contrary to what many people believe ,a spider is not an insect .A spider has eight legs ,while an insect has six legs .In addition ,there are only two main divisions in a spider—the head and the thorax ,while an insect has a head ,thorax ,and an abdomen .A spider usually has eight simple eyes ,and has gland ,to produce strands of silk which come out of openings called spinnerets .
You also may be surprised to learn that spider silk has been used by man in such devices as astronomical telescopes ,guns and engineers ’ levels .The fibres are excellent for sighting marks .A spider silk is extremely strong and can be either dry or sticky .
There are four general types of webs which spiders can make .There are the irregular mesh web ,the orb web ,and the sheet web .A web can also be a combination of several different types .Perhaps the most lovely spider web is the orb web .Engineers believe that the orb web shows the fact that the suspension(悬)bridge actually was invented by the spider .Spiders often can make a web quite quickly ;for example ,it is possible for a spider to weave a large web in only one hour.
64.What is the passage mainly concerned with ?
A.Civilization and spiders.
B.A description of spiders.
C.People’s attitudes toward spiders.
D.People’s knowledge of spiders.
65.Which of the following is true of a spider ?
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