单项选择题

2.When someone is using a slow rising tone, what does that mean?
A、The person is sad
B、The person is happy
C、The person is angry
D、The person wants to go to sleep

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不定项选择

芳香烃燃烧易形成胶质，沉积在进气门、火花塞、燃烧室等表面，增加燃烧室的积炭而增大二氧化碳排放。

A．正确
B．错误

单项选择题

则为