题目内容

公路交通大气污染源主要由两部分组成,一是公路施工及养护期间产生的扬尘,沥青烟等大气污染物;二是公路营运期间机动车辆排放的尾气及在道路上产生的扬尘.

A. 对
B. 错

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A ___________ is a student in the second year of college .

A. freshman
B. junior
C. sophomore
D. senior

You are eighteen years old now and it's time for you to __________ of your life and study.

A. take charge
B. take to
C. take off
D. take in

I hope in years to come he will ___________ the decision he makes today.

A. reflect
B. reflects
C. reflect on
D. reflect in

If someone or something ____________ two qualities or features, they have both those qualities or features at the same time.

A. compress
B. confirm
C. combined
D. combines

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