【解析】A　根据下句的isolation及两句间的转折连词But可推出答案A。 8．通过上下文理解猜测词义 【例】(2017新课标Ⅰ卷)Sadly，the abundance of passenger pigeons may have been their undoing. Where the birds were most abundant, people believed there was an ever­lasting supply and killed them by the thousands.Commercial hunters attracted them to small clearings with grain, waited until pigeons had settled to feed, then threw large nets over them, taking hundreds at a time. The birds were shipped to large cities and sold in restaurants.

　　25．The underlined word “undoing” probably refers to the pigeons'________. A．escape B．ruin

　　C．liberation D．evolution 【解析】25.B　根据“there was an ever­lasting supply and killed them by the thousands. Commercial hunters attracted them to small clearings with grain, waited until pigeons had settled to feed, then threw large nets over them, taking hundreds at a time.”可知很多鸽子都被捕捉并杀死卖往餐厅。所以该词应该是指鸽子遭到了毁灭性的打击。故B正确。

　　【例2】These different kinds of learning disabilities are known by different names.For example，a person who has difficulty reading may have dyslexia.Someone who cannot do mathematics may have a disorder called dyscalculia(计算困难)． Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects(a comb，a key，an orange and so on)，changing the number of objects had an effect separate from changing the objects themselves.Could it be the pattern that two things make，as opposed to three? No again.Babies paid more attention to squares moving randomly on a screen when their number changed from two to three, or three to two. The effect even crosses between senses.

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