. What is the problem with helium?1. What is the problem with helium?A. It is bad for our health.A. It is bad for our health.B. It is running out.B. It is running out.C. It is no longer safe.C ……

with helium?1. What is the problem with helium?A. It is bad for our health.A. It is bad for our health.B. It is running out.B. It is running out.C. It is no longer safe.C. It is no longer safe.D ……

Helium is used to fill hot-air balloons.   VCG  We are running out of the important gas, heliumWe are running out of the important gas, helium地球上的氦气不够用了！地球上的氦气不够用了！Flying ……

American adults.Day 3Day 3Running out of helium (P6)Running out of helium (P6)Choose the best answer.... Something with many uses.2. Why is helium important for MRI machines?2. Why is helium important ……

, the BBC added.People are working to stop helium from running out. NBC News said that new MRI machines... like the old ones.People are working to stop helium from running out. NBC News said that new MRI ……

elements in our daily lives, yet largely ignored by people. The world keeps running low on helium.... The world keeps running low on helium, with not enough available four times in the last 20 years, said ……

：run low (on sth) ......快用完了。 同义表达：run short of 快用完了；缺乏。区分：run out of 用完了。We’re running low on milk.We’re running low on milk.He ran out of time to finish the game.He ran out of time to finish the game ……

Say no to balloons (P3)Choose the answer: 1. Why does Ryan dislike helium-filled balloons?a. The balloons are difficult to break down.b. The helium inside is a limited resource.c. The balloons ……

and interesting.For the helium balloon experiment, the children had to work out a math problem first...氢气球、起重机…… 这堂课上的道具真不简单。词数 241 课件见网站 建议阅读时间 6分钟 TIE helium balloons (氢气球) to your body and jump from ……

The pair will carry out a few scientific experiments on the way, such as gathering space dust... helium balloon ever built. Made of composite graphite Kevlar rods and specially strengthened ……

will investigate the possibility of extracting helium-3 isotope – a powerful non-radioactive nuclear fuel.... But I don't think either side wants to do that just yet."Cooperation was an issue borne out ……

and China are attempting to reach the moon to test for isotope Helium 3. This non-radioactive... the technology needed to release its energy potential. "Helium 3 requires a temperature of almost 1 billion ……

are actually a mixture of foam (泡沫) and lighter-than-air gases such as helium (氦).The company uses machines to make the clouds. The machines can pop (喷出) one cloud out every 15 seconds. The clouds ……

mapped out many of the technical aspects of such a tour. People will get into a capsule, and a high-tech balloon filled with helium (氦) gas will carry them about 40 km above the Earth’s surface ……

and observe closely.  What happened?What happened?Colored water comes streaming (流动) upward out... an equal amount of cold water).Colored water comes streaming (流动) upward out of the jar and flows ……