单项选择题

Without its web, a web-spider would NOT be able to ______.

A．walk quickly
B．see the prey clearly
C．conserve its energy
D．survive
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单项选择题
That a spider is able to finish an incomplete web of another proves that ______.
A．a spider re-uses its web protein to reproduce new silk
B．spiders have a highly preprogrammed brain
C．the web is everything to a spider
D．a spider is able to remedy a destroyed web
单项选择题
A title that would best express the main idea of the passage would be ______.
A．Secrets of Spiders
B．Secrets of the Spider Web
C．Secrets of Nature
D．A New Discovery of Scientists
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