Riding a motorcycle at ________ high a speed on ________ a crowded street is dangerous to everyone, including the motorcyclist himself．A.so; soB.such; suchC.so; suchD.such; so
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C解析本题要注意so+adj．+a(an)+n．和such a/an+n．的结构。第一空后虽然有名词speed，但它前面已有冠词a，而形容词high紧挨在空格后，所以应该用so来修饰。此处还可说成at such a high speed。