A、the vehicles are not well sealed off
B、they are driving alone on the way
C、the vehicles have a no smoking sign inside
D、their colleagues use the vehicles later in the day
第1题
A、xiūdehǎo 修得好
B、xiūbuhǎo 修不好
C、xiūdehěnhǎo 修得很好
D、?
第7题
A、microorganisms and their effects
B、community and family life
C、human life
D、development of the human race
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