make tiny webs inside small openings in a plant's skin...”可知，mesh­web weavers织的网比较小，因此选B。

　　答案：B

　　8.The passage is mainly about.

　　A.how to deal with insects in the garden

　　B.how spiders catch insects

　　C.killing garden insects with spiders

　　D.the kinds of spiders that live in gardens

　　解析：主旨大意题。本文主要讲述了美国种植园利用蜘蛛降低害虫的做法；根据第一段的前几句话也可以明确本文的主题大意，第二段具体介绍了种植园里的几种蜘蛛。故选C。

　　答案：C

　　C

　　(2010·山东济宁质检)After analyzing imaging scans collected over 17 years， researchers had found that the brains of highly intelligent children develop in a different pattern from those with more average abilities.

　　The discovery， some experts said， could help scientists understand intelligence in terms of the genes that develop it and the childhood experiences that can improve it.“This is the first time that someone has shown that the brain grows differently in extremely intelligent children，” said Paul Thompson， a brain­imaging expert at the University of California in Los Angeles.

　　The finding is based on 307 children in Bethesda， Maryland. Starting in 1989， they were given regular brain scans using magnetic resonance imaging(磁共振成像). The general pattern of maturation(成熟)， they reported on Thursday in Nature， is that the cortex(皮层)grows thicker as the child ages and then thins out. The causes of the changes are unknown， because the imaging process cannot see down to the level of individual neurons(中子).

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