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PP中3道语法
86. The Milky Way is a flat spiral galaxy who contains an estimated 100 billion stars, including the Sun. 是否C中多一个an? (看来有多冠词,介词,连词;还有缺冠词,介词的情况) A中用who指代物,是什么用法?
96. Cyclamates were introduced in the early 1950's as alternative sweeteners for use by individuals who needed reducing their sugar intake for medical reasons. D中改成to reduce? Need to do 和need doing 有何区别?
123. Flash photography is widely used for taking pictures when the natural light is insufficient, such as outdoors at night and indoors most of time. 选D如何改?
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