英语（人教版）课后限时自测17必修4　Unit2　Workingtheland.doc

第  PAGE 4 页 共  NUMPAGES 4 页 课后限时自测(十七) Ⅰ.语法填空 The cold came a little bit __1__(early) this winter.The weather has been tough and unforgiving. Beijing witnessed the earliest snowfall since the 1950s on Nov.3. Temperatures in many parts of China have hit record lows.Cold weather also brought heavy snowstorms to the US，Russia and Europe，__2__(cause) many deaths. You may not think they are related in any possible way，__3__ scientists say that the extreme cold started in the North Pole，__4__ the sea ice is melting rapidly because of the burning of fossil fuels.This summer，the National Snow and Ice Data Center in the US announced that the sea ice coverage in the Arctic had reached its lowest level—with less than half of the coverage __5__ had four decades ago. Large amounts of sea ice loss could change __6__ air circulates in the atmosphere.At the same time，__7__(melt)sea ice also releases more ocean water，which __8__(result)in increased water vapor in the atmosphere that can be transformed __9__ snow，according to National Geographic. Also，the attack of the cold came quickly and without a break this year.“This left no time for the temperature to revive，which caused the cold to accumulate，”explained Wang Jiaoyan，__10__ engineer at China Meteorological Administration. 【答案】　 1．earlier　考查形容词比较级。句意为：今年冬天冷空气来得稍早一点。a little bit“少许，一点儿”，根据语境应用形容词比较级。 2．causing　考查非谓语动词。Cold weather与cause是逻辑上的主谓关系，故应用cause的现在分词形式作结果状语。 3．but　考查连词。该空前后是转折关系，故应用转折连词but。 4．where　考查非限制性定语从句。先行词是the North Pole，空处引导非限制性定语从句，在从句中作地点状语，故填where。 5．it　考查代词。空处指代the Arctic，应用it。 6．how　考查宾语从句的引导词。空处引导宾语从句，表示方式，应填how。句意：大量海洋冰块的消失会改变空气在大气中的循环方式。 7．melting　考查非谓语动词。根据下文的“releases more ocean water”可知，这里指的是“正在融化的冰块”，因此用现在分词作定语。 8．results　考查动词时态。result是定语从句中的谓语，定语从句的主语是先行词more ocean water，且表示一般的情况，故应用一般现在时。 9．into　考查介词。transform...into...是固定搭配，意思为“把……转化为……”。 10．an　考查冠词。空处及其后面的部分在句中作同位语，泛指一位工程师，且engineer的读音以元音音素开头，故应用不定冠词an。 Ⅱ.阅读理解 The Republic of Vanuatu is an island nation located