1. Do Silicon Valley entrepreneurs think AR is the biggest thing in tech?

Many believe it's the 'next big thing', so although it's not there yet, it will become very important. 

2. What is the main difference between AR and VR?  

AR allows people to move around the physical world while experiencing a virtual world, while VR restricts peoples' movement in the physical world. 

3. True or false: A NASA scientist stood on stage with Alex Kipman.

False. A hologram of a NASA scientist was on stage with Alex Kipman.        

4. Which short word meaning 'technology' was used in the article?

Tech. 

5. What does Alex Kipman compare our stage of technological development to?

He says we're like "cavemen", which means a very limited stage of development.

2.  请你在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处 。

1. The Martian surface is very hot and dry.

2. Many things are possible in virtual that you can't do in the real world.

3. The policy was introduced six months ago but its benefits haven't been felt by the population at large.

4. Devices such as headsets, tablets and smartphones can be used to experience AR.

5. You have to work hard if you want to reach your potential.

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