20．A.engaged

　　B．interested

　　C．successful

　　D．skillful

　　答案：B　考查形容词词辨析。这可能是作者一直对科学感兴趣的原因。由此并结合选项的词义可知，B选项符合语境。故答案选B。

　　Ⅲ.阅读理解

　　(2017·湖北省七市联考)

　　Talking plants might sound like characters in a fairy tale. But recent scientific studies have shown that plants communicate with each other and with other living things in a surprising number of ways. To understand them, scientists say, we just have to learn their language. Farmers are especially interested in what plants have to say.

　　“Plants are able to communicate with all sorts of organisms (有机体). They can communicate with giant bacteria, with other plants and with insects. They do this chemically，” said Cahill, an Ecology Professor of the University of Alberta in Canada.

　　Plant scientists are just beginning to understand this chemical “language”. Cahill says studies have shown, for example, that plants can evaluate conditions in their immediate environment and take appropriate actions.

　　Plants have an ability, for example, to signal pain or discomfort caused by anything from temperature extremes to an insect attack. Jack Schultz, a professor of chemical ecology at the University of Missouri, says when a plant senses that it's being eaten, it cannot walk away from trouble; on the contrary, it will release a chemical vapor that alerts other plants nearby.

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