ss prey than spiders with their normal colorful stripes. Repeatedly he found that the blackened spiny spiders always attracted and caught less prey.

¡¡¡¡¡°Perhaps the colors and patterns of their dorsal surface mimic the color of food ¡ª such as flowers ¡ª for visually oriented prey. It is also possible that the dorsal surface of the spiny spiders is highly reflective in the ultraviolet spectra, because these indicate the presence of field clearings adjacent to dense forests.¡±

¡¡¡¡Hauber also learned that spiny spiders set their webs at an angle and that they sit on the underside of their webs with their backs to the ground. This suggests, says Hauber, that sun and nearby vegetation offer camouflage for the web. ¡°Daytime webª²building and hunting, along with the web placement and orientation, is consistent with behavior that attracts prey traveling from darker areas to lighter ones, ¡± says Hauber.

¡¡¡¡Funding for the research came from the Howard Hughes Medical Institute Predoctoral Fellowship program.

¡¡¡¡1. This passage is mainly about .

¡¡¡¡A. the research about the means of spiny spider to entice prey

¡¡¡¡B. how spiny spider entice prey by using conspicuous body color

¡¡¡¡C. why colors are useful for spiny spider to entice prey

¡¡¡¡D. the difference between spiny spider and other animals¬ð catching prey

¡¡¡¡2. The purpose of the third paragraph is .

¡¡¡¡A. to analogy how the spiny spider use color to catch prey

¡¡¡¡B. to describe lively the method spiny spider uses

¡¡¡¡C. to describe the detail about casinos

¡¡¡¡D. to tell the readers why the insects are attracted by spiny spider

¡¡¡¡3. According to this passage, which of the following is NOT true?

¡¡¡¡A. Color is usually uses to attract mates in the animal kingdom, which is known long by human beings.

¡¡¡¡B. Generally, bright colors can only make other animals alterative.

¡¡¡¡C. Animals using traips usually haven¬ðt bright colors and contrasting patterns.

¡¡¡¡D. Parrots also have bright colors because they use color to entice prey like spiny spider.

¡¡¡¡4. The experiment Hauber has done can tell us that .

¡¡¡¡A. spider with the black color caught less prey than those with their normal colorful stripes

¡¡¡¡B. the colors and patterns of spiny spider are like some flowers for visually oriented prey

¡¡¡¡C. the dorsal surface of the spiny spider is highly reflective in the ultraviolet part of the spectrum

¡¡¡¡D. in enticing prey, bright colors and patterns can help spiny spiders a lot

¡¡¡¡5. The proper title for this passage should be .

¡¡¡¡A. The Study on How Spiny Spiders Entice Prey

¡¡¡¡B. Spiny Spiders Use Color to Entice Prey, Not Mates

¡¡¡¡C. The Difference Between Spiny Spider and Other Animals

¡¡¡¡D. The Using of Colors in Enticing Prey

¡¡¡¡Passage 4

¡¡¡¡The cause of Alzheimer¬ðs disease is unknown, but various studies suggest that its risk factors extend beyond genetics. Some studies have associa

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