2. 考研
  3. A. pollutant B. measured C. related A. and mainly traffic【T1】________ B. where you are directly in the path of the【T2】______

A. pollutant B. measured C. related A. and mainly traffic【T1】________ B. where you are directly in the path of the【T2】______

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问题 A.  pollutant
B.  measured
C.  related
A.  and mainly traffic【T1】________
B. where you are directly in the path of the【T2】________source
C. 【T3】________levels of exposure to ultrafine particles
    Researchers have discovered that your level of exposure to pollution can vary according to what method of transport you use. The researchers looked at five modes of transport, including walking, cycling, car, taxi and bus, and【T4】________when travelling on them. Ultrafine particles are less than 100 nanometers in diameter【T5】________Their small size and large surface area means it is possible to inhale large quantities which makes them particularly dangerous.
    It was a real surprise to find travelling by taxis resulted in the highest levels of exposure and walking the least. The higher exposure from travelling in taxis may come from actually sitting in the vehicle while being stuck in traffic【T6】________Also the fact that taxis are probably on the road for much longer than your average car could cause an accumulation of ultrafine particles.
【T5】
选项 A、 
B、 
C、 
答案A
解析 本题在解释什么是ultrafine particles：细微颗粒的直径小于100纳米________。选项A是并列结构，选项B是一个定语从句，显然A选项and mainly traffic related“并主要与路上的车辆有关”符合语境。B选项中where引导的定语从句需要一个表示地点的先行词，diameter无法起到这个作用，排除B，故选A。
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