Powered by sun and sweat, they are showing up in cities across the country. The $5,500 bike/car hybrid is called "The ELF." The egg-shaped machine is called an "ELF," short for Electric, Light and Fun.

"Oh, I get a lot of funny looks, Sometimes I'll see people with the kids in the back and they're waving. It's a great mix of a car and a bike," said Bush.

It's actually a backwards tricycle powered by a bike pedal and a small solar powered motor that can carry passengers and cargo up to 550 pounds. It is invented by former race car technician Rob Cotter. 

The ELF requires no insurance or gasoline and is pollution free. It does 20 miles per hour with straight pedal power. Add the motor and the ELF can do 35. It's estimated that the average ELF driver could remove three tons of carbon dioxide from the atmosphere every year. 

In 18 months, Cotter has build and sold 450 ELFs and plans to triple that this year. He also wants to sell them in developing countries. "Most of the planet, they don't have cars," Cotter says "They don't have cars. Some of them hardly have roads."

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1.What is “ELF” powered by?

A Sun.

B Sweat.

C Gasoline.

D Sun and sweat.

解析：选D。D细节理解题。根据文章第1句Powered by sun and sweat,…可知，故选D。

2.How many tyres are in the back of “ELF”?

A Only one.

B Two.

C Three.

D Four.

解析：选A。A 细节理解题。根据第3段第1句It's actually a backwards tricycle… （这实际上是一辆后部超前的三轮车）可知，故选A。

3.How far will “ELF” go in an hour when it is powered by sun?

A 20 miles.

B 25 miles.

C 35 miles.

D 25 kilometres.

解析：选C。C 细节理解题。根据第4段第2、3句It does 20 miles per hour with straight pedal power. Add the motor and the ELF can do 35.可知，故选C。

4.How many ELFs does Cotter plan to sell this year?

A 450

B 900

C 1350

D 1800

解析：选C。C判断推理题。根据最后1段Cotter has build and sold 450 ELFs and plans to triple that this year.句中triple表示“增至三倍“可知，故选C。

5. Which do you think is NOT the advantage of “ELF”?

A No insurance.

B Fly in the air.

C No gasoline.

D Pollution free.

解析：选B。B内容理解题。文章并未提到该车可以在空中飞行，所以不是其优点，故选B。