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单选题
7.The carbon we produce when we breathe is much less thanproduced by a car.
A
A. one
B
B. it
C
C. that
D
D. those
答案解析
正确答案：C
解析：
7.【翻译】我们呼吸时产生的碳，要比小汽车产生的碳少得多。【精析】C one相当于-a（n） +可数名词单数”，泛指同类事物或人中的一个;it常用来特指上文提到过的同一个事 物;that常用来特指上文提到过的同一类事物，可指代单数名词或不可数名词;those是that的复数形式,特指上文提到 的复数名词。根据句意可知，空处指代句中的不可数名词carbon,且表示的是同一类事物，所以应用that。故选C：
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