中东地区动荡不安，长期成为世界热点地区的主要原因是（　　）

某同学在用电压表测量串联电路和并联电路两端电压时，分别按图甲、乙两电路图连接．

B

    Scientists say life will be very different in 2050.

    First, there will be no TV channels (频道) in 2050. People will choose a program (节目) from a computer and watch it on TV. In 2050, we will get information from the computers only.

    Second, water will be a big problem in 2050. In many places, people won't have water to drink.

    Third, cars will use new and clean fuels (燃料) and they will go very fast. There will be a computer in every car. And the computers will control the cars and there won't be any accidents (事故).

换偏旁变新字

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