2. When it comes to how much you can spend on a wedding, ______. 

it’s a piece of the action       take to the skies        the race is on       the sky’s the limit

3. Our new helicopter can stay ______ for 10 hours before needing to refuel.

airborne       aviation       aboard       to the skies

4. Lots of people rented their apartments to visitors when the Olympics came to London. They all wanted ______.

to take to the skies       to cost the earth       to buckle up       a piece of the action

5. Your plan is interesting, but there’s not much ______ for failure.

headroom       leeway       congestion       viability

答案   1. 阅读课文并回答问题。 

1. Why are batteries an issue? 

Batteries only last a short time before needing to be recharged. US regulators also demand aircraft carry at least 20 minutes of spare fuel, which limits the flight time even further.

2. What does the author believe is the most significant challenge for drone taxis to be successful?

The author believes that the biggest problem is convincing the public and regulators that drone taxis are safe.    

3. Which word means ‘disadvantages’?

Downsides.

4.Which word means ‘a new business designed to solve a specific problem’?

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