C．Teenagers of the time are not doing the right thing.

　　D．The writer of the letter is a teenager from a singleparent family.

　　答案：B　推理判断题。根据文章第一段可知，社论中就两个年轻人在送报纸的兼职工作中的不诚实行为做了很多评论，不赞成年轻人做兼职工作，故可推断出报社刊登的文章应是一篇“反对青少年做兼职工作”的文章。故答案选B。

　　B

　　(2016·河北省唐山市统一考试)Hybrid cars (混合动力车) are cars that run on petrol and electricity. They have a small standard petrol engine and a battery

　　electric motor to provide electric power.

　　There are some differences between different models of hybrid cars, but the general principle is that the car runs on petrol, and the electric motor kicks in when additional power is required, for example, when going uphill or accelerating. In some hybrid cars the petrol engine turns itself off when not needed, for example when the car has stopped at traffic lights, keeping only the electric engine running.

　　Conventional cars have large engines to deal with driving uphill and accelerating. Hybrid cars have much smaller petrol engines, improved by electric motors when needed, so they use less petrol. Another way that fuel consumption is cut is by a system of “regenerative (再生的) braking”. The electric motor is used to slow down the car, rather than conventional brakes. The energy produced by slowing the car is changed into electrical power, which is automatically stored in the battery. In effect, the battery recharges when you brake. In conventional cars the energy produced when braking is wasted.

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