我给生字穿新衣

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据报道：近几年有许多重大火灾都是因线路连接处接触不良所造成的，教训十分深刻．线路连接处接触不良引起火灾的原因是：当线路连接处接触不良时，该处的电阻将____ （减小/增大），电流通过该接触处产生的热量____ （减少/增多），从而使局部温度升高，同时接触处的电阻又将随着温度的升高而____ （减小/增大），形成电热的逐步积累和恶性循环，以致引发火灾．

完形填空

    People all over the world eat rice. 1 people in Asia (亚洲), Africa (非洲) and South America 2 it every day of their lives. Some people almost don't eat 3 except rice.

    Rice is a kind of 4. There are more than 7, 000 kinds of rice. Most kinds are water plants. Farmers 5rice in many countries even in the southern part of Russia and in eastern Australia.

    No one really knows where rice 6. Someone in China wrote about it almost 5,000 years ago. Some scientists (科学家) think that rice 7 in West Africa first, but 8 think it 9from India and then was 10to other parts of the world.

When you want to learn a language， you should learn from the ________ words.