The substance can be added to gasoline to ______ the speed of automobiles.

　　A. quicken   B. shorten   C. loosen   D. enlarge

A


解析:

Shorten v.縮短, (使)變短；loosen v.解開, 放松, 松開； enlarge v.擴大, 放大； 詞綴-en通常加在某些形容詞的前面或后面，使其變成相應的動詞，該詞綴的含義是“使變得更加..”, 如：enlarge就是“使變得更大/擴大”

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