答案:A 细节理解题。根据文章第二段中的“Plants are able to communicate with all sorts of organisms (有机体)... They do this chemically.”可知,植物能够与其他生物通过化学方式进行交流。故答案选A。
2.When being eaten by an insect, the plant will ________.
A.walk away from trouble
B.change its chemistry to kill the insect
C.release a chemical vapor to “ask” other plants for help
D.give off nice chemicals to attract friendly insects killing the pest
答案:D 细节理解题。根据文章第三段中的“when a plant senses that it's being eaten... on the contrary, it will release a chemical vapor...”以及文章倒数第二段中的“Those chemicals attract friendly insects that attack the pests eating the plant.”可知,当植物被昆虫吞食的时候,植物会释放一种化学蒸汽,这种化学蒸汽能够吸引有益的昆虫来袭击害虫。故答案选D。
3.The underlined word “alert” most probably means “______”.
A.warn
B.protect
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。
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