阅读理解。根据短文判断下面各句正(T)误(F)。

     There is a farm near my home. The farmers there grow rice and wheat. They have many animals on the

  farm. But they don't use them to do farm work. They use a tractor. We often go to the farm after school.

  We can play with the animals, walk, read books or help the farmers pick corn there. I like walking or

 doing some reading on the farm because the air there is nice and clean.

   You can see a lake on the farm. There are many fish in the lake. We often go fishing on Saturdays and

 Sundays. We often swim in the lake in summer and skate on it in winter, too.

( ) 1. On the farm near my home, farmers use animals to do farm work.

(     ) 2. I like reading books on the farm because there is a lake on it.

(     ) 3. The air on the farm is very clean.

(     ) 4. On Saturdays and Sundays, we often swim in the lake.

夏季是雷电多发季节，强雷电的内部温度可高达3×10⁴℃。因树木中含有水分，当雷电击中树木时，强电流通过树身会产生大量的热，使树木中的水分发生__________（填物态变化的名称）现象，形成高温高压的水蒸气，这些气体体积迅速膨胀对树木_________，会将树木劈开。