A. join B. conversation C. switched off D. a short time |
—Wait for a moment. I'm coming.
One evening, before Daisy went to buy a packet of sweets, she asked her family if anyone needed anything. Benny, Daisy's brother wanted to play a trick （诡计） her. He asked her to buy （he） a packet of electricity. Daisy agreed and then went out.
Benny laughed and he thought Daisy couldn't buy electricity in （packet） like sweets! He said Daisy was （fool）. Parents told him not （say） that and then asked him something about electricity. Benny said, "Electricity gives us power. It flows wires. （part）, it is like water." Daisy came home and gave some batteries to him , Benny thought they were batteries instead of electricity. "The （chemical） inside batteries produce electricity." said Dad. After （hear） that, Benny turned red.
Electricity comes into peopled flats through thin wires. These are connected to cables under the street and people connect the cables to a power station.
electricity turn off what if... must safely wire |
A: Hi, Sue, would you like to talk about electricity?
B: Yes, I'd love to.
A: Well, how can we use lights safely?
B: We must turn off the lights off when we leave the room?
A: What must we do if the bulb is broken?
B: We must turn off the electricity when we change the bulb.
A: What if...
B: I think...
Do you know the way of using wind power to make electricity? There are many advantages （优点） of using wind to make electricity. Here're some of them.
First, it may be one of the cheapest ways to make electricity. Second, it can make and store hydrogen gas （氢气）. The most important one is that it won't pollute the environment. Besides, the wind power can be reused.
But large wind farms might kill birds, too, because the birds always fly into the wind turbine （风力涡轮机）. Scientists are looking for ways to stop it.
Experts said that by the middle of the 21st century wind power could supply （供应） more than 10% of the world's electricity. The wind really helps us a lot.
