Around the world, people are more and more worried about the environment. Many people now prefer products and companies (公司) that care about the earth and cause less pollution. This need for green products has led large companies to change their business.
Before, customers used cheap plastic (塑料) bags, and then threw them away. But now most supermarkets and stores usually provide reusable shopping bags for them. This causes less waste. They also offer more local products, because less energy is needed for carrying them one place to another.
To help lower air pollution, big car factories are looking for other ways to control the amount of oil. Cars that use much less oil are very popular. Many companies are also developing fully electric cars. They produce no air pollution at all. Both kinds of cars have another advantage: They are cheaper to run and people don't need to worry about oil prices.
The airline companies face an even greater green challenge. Airplanes use much more oil than cars. So many airlines are now developing planes that can run on some other kinds of oil. They create less pollution and cost less. The companies are also developing a new kind of planes, and some of them use only solar panels (太阳能板) to fly!
Green businesses used to be polular with only a small group of people. But now, more and more companies have to show they care about the environment. Many products are marked "green" in order to look nice. However, people still have to be careful when choosing green products. It's important to make sure that products are as environmentally friendly as the businessmen say.
c.Running at low costs d. Producing no air pollution
A.a and b B . c and d C . b and c D . a and d
B . 
C . 
D . 
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