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Moving air—such as the wind on a breezy （微風的） day—often seems to "stick" to solid objects （固體），as this experiment shows. You'll need ▲A short candle in holder ▲Matches ▲Salt box，and large container （容器） ▲Look for an adult helper What to do Step 1 Put candle on the table and ask adult to light it. Step 2 Put container on the table next to the candle. Step 3 Blow on the other side of the container （no candle side）. |
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What happened？Why？ The candle flickers （閃爍）and you may be able to blow it out.This is called the "Coanda Effect" after a scientist from Romania. Air from your mouth is divided into two steams（水汽） when it hits the container.They flow around both sides，sticking close to the container.Then they join and blow out the candle. |
C
C
.①A long candle
②Matches
③A large container
④A tiny container
A． ①②
B． ②④
C． ②③
D． ③④
（2）Which of the following is TRUE from Step 1 to Step 3？
D
D
A．The candle should be put on the container.
B．An adult helps to put the candle under the table.
C．We should blow the container facing near the candle.
D．We should blow the container at the same level as the flame.
（3）What will probably happen in the end？
B
B
A．You can't blow the candle out.
B．The steams of air join together again.
C．The steams of air flow under the bottom of the container.
D．The air from your mouth is divided into several streams when hitting the container.
（4）In which part of a newspaper would you probably read the passage？
C
C
A．Sports News.
B．Job Wanted.
C．Science Study.
D．Star Stories.
（5）What is the passage written for？
A
A
.A．To show "Coanda Effect" by doing an experiment
B．To introduce a new invention
C．To give instructions on making a container
D．To show how to blow out a candle
【答案】C；D；B；C；A
【解答】
【點評】
聲明：本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有，未經(jīng)書面同意，不得復制發(fā)布。
發(fā)布：2024/5/27 14:0:0組卷：2引用：1難度：0.5
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