题目内容
12．A group of young Americans have come to Beijing for a visit．Half of them，___is，50persons，can speak Chinese fluently．（ ）| A． | that | B． | which | C． | who | D． | it |
分析 一群年轻的美国人来北京参观．其中半数人，即50人，可以讲流利的中文．
解答 答案：A．that is即是，就是说，为固定搭配，是对half of them的进一步解释说明，在句中做插入语成分，故选A．
点评 本题考查插入语的用法，插入语在句中语法上是独立的，逗号隔开插入语与句子其他成分，可观察逗号及删去对句子表达有无影响来判断是否为插入语．
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3．
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Welcome to San Francisco，a place famous for its beautiful parks，hilly streets and lovely beaches．But the bridge is undoubtedly the most well-known symbol of the city．Before its completion in 1937，the bridge was considered impossible to build because of the foggy weather，powerful winds，and （45）E ocean currents in the city．However，despite the difficult conditions，the bridge was built in no more than four years．Its total length is nearly 2 kilometers．
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| A．magical B．cultural C．meets D．built E．strong F．damaged G．entrance H．views I．calendar J．ranked K．lit |
Welcome to San Francisco，a place famous for its beautiful parks，hilly streets and lovely beaches．But the bridge is undoubtedly the most well-known symbol of the city．Before its completion in 1937，the bridge was considered impossible to build because of the foggy weather，powerful winds，and （45）E ocean currents in the city．However，despite the difficult conditions，the bridge was built in no more than four years．Its total length is nearly 2 kilometers．
San Francisco （46）J first on Lonely Planet's list of the best cities to visit in 2013．According to the world's largest travel publisher，it came top as a result of its （47）B mix．
According to the US 2010 census（人口普查），21percent of the city's population was made up of Chinese people．San Francisco's Chinatown is the largest outside of Asia and the oldest in North America．Two traditional festivals，the Spring Festival and Mid-Autumn Festival，are the biggest events of the year on the city's （48）I．
If yellow cabs are a key part of New York city life，then the cable car is San Francisco's equivalent．The first cable car came into public service in 1873，and the slow and noisy vehicle has been a symbol of the city ever since．The cable car network was once（49）F by a serious earthquake but，luckily，it has now recovered and provides better（50）H than the subway．
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