5.According to international standards,a country or region is considered to have an‘a(chǎn)ging society'______ the number of people over 60reaches 10% or more of its population.( 。
A.unlessB.onceC.thoughD.before

分析 按照國際標(biāo)準(zhǔn),一個(gè)國家或地區(qū)一旦超過60歲的人數(shù)占到人口的10%或以上被認(rèn)為是"老年化社會(huì)".

解答 答案:B 考查從屬連詞.A項(xiàng):除非;B項(xiàng):一旦;C項(xiàng):盡管;D項(xiàng):在…之前.根據(jù)句意,B項(xiàng)正確.

點(diǎn)評(píng) 考查從屬連詞,弄清楚各個(gè)從屬連詞引導(dǎo)的各種從句及特殊結(jié)構(gòu)和用法,準(zhǔn)確地翻譯句子,然后根據(jù)句意,選擇最合適的答案.

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