题目内容：

    These days everyone is worried about the size of their carbon footprint. In order to reduce global warming, we need to make our carbon footprints smaller. But how much CO are we responsible for?

A new book by Mike Berners-Lee (a leading expert in carbon foot-printing) might be able to help. The Carbon Foot print of Everything looks at the different things we do and buy, and calculates the amount of CO2 they produce, including the ingredients, the electricity, the equipment, the transport and the packaging. And it’s frightening how much carbon dioxide everything produces.

But all of this can help us decide which beer to drink. From Berners-Lee’s calculations, it’s clear that a pint (568 ml) of locally-brewed (酿制的) beer has a smaller carbon footprint than a bottle of imported beer. This is because the imported beer has been transported from far away, and it uses more packaging. The local beer only produces 300 g of CO2-but the imported beer produces 900 g! So, one pint of local beer is better for the environment than three cans of cheap foreign beer from the supermarket.

Berners-Lee has even calculated the carbon footprint of cycling to work. Nothing is more environmentally - friendly than riding a bike, surely? Well, it depends on what you’ve had to eat before. To ride a bike we need energy and for energy we need food. So, if we eat a banana and then ride a kilometer and a half, our footprint is 65 g of CO2. However, if we eat bacon before the bike ride, it’s 200 g. In fact, bananas are good in general because they don’t need packaging. They can be transported by boat and they grow in natural sunlight.

So, does this mean that cycling is bad for the environment? Absolutely not. If you cycle, you don t use your car; and the fewer cars on the road, the fewer traffic jams. And cars in traffic jams produce three times more CO2 than cars travelling at speed. Cycling also makes you healthy and less likely to go to a hospital. And hospitals have very big carbon footprints!

So, maybe it’s time for us all to start making some changes. Pass me a banana and a pint of local beer, please.

1.Which of the followings produces the smallest carbon footprints?

A. A pint of local beer.

B. A bottle of imported beer.

C. A banana before a 1.5 km bike ride.

D. Bacon before a 1.5 km bike ride.

2.According to the article, the author suggests choosing the local food because it is ________.

A. more tasty B. easier to buy

C. better packaged D. more energy-saving

3.The purpose of writing this article is to ________.

A. promote a new book

B. advertise the imported beer

C. instruct how to measure the carbon footprint

D. encourage people to reduce the production of CO2