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】______

admin2021-09-23  5
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.
【T6】
选项 A、 
B、 
C、 
答案B
解析 本题句的上下文意思主要是：我们惊奇地发现，乘出租车接触污染物程度最高，而步行则最低。这可能是因为如果乘出租车遇到塞车，坐在车里直接置身于污染源之中。空格前面是traffic，可以作where引导的定语从句的先行词，相当于“in traffic，you are directly in the path of the pollutant source”，故选B。
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