C.threaten
D.allow 答案:A 词义猜测题。根据上下文语境可知,植物在遭受攻击时会释放一种化学物质,这种化学物质有两种功能,一是警示危险的存在,二是发出求助信息。由此可知,此处的“alert”应该意为“警示,警惕”,即warn。故答案选A。 4.Which would be the best title for the passage? A.Communication between Plants
B.A Chemical “Language” C.Plants Can Talk
D.How Plants Protect Themselves 答案:C 标题概括题。通读全文可知,文章主要讲述了“植物的特殊语言”及功能。C项既能概括文章的主题又生动风趣,尤其是talk一词充满了拟人化的幽默感。故答案选C。 Ⅲ.完形填空 (2016·海淀区期末) Education from My Father My memories of my father are slim because he was so sick in the last years of his life. But there are
__1__
that I am often reminded of and which may have had some bearing on my love of
__2__. When I was small I was somewhat
__3__
of lightning and thunder. My father explained it. The explanation was in
__4__
that a child could understand but was basically correct. I gained a better
__5__
later, but I didn't have to unlearn anything. What he said was that there was electricity in the clouds
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