1 . Electric cars are already greener than petrol cars in almost every part of the world today, according to researchers. They say electric vehicles are “a no-regret choice” even in places where power nets haven’t gone fully green.

Some previous comparisons suggested petrol cars produce lower net carbon emissions (净碳排放量) over their lifetime than battery- powered cars. Yet these analyses have often compared only two fixed models of cars.

Instead, the researchers from Radboud University looked at the average emissions across many classes of car to get a clearer global picture. It includes during its production, while it is being driven and when it is broken, for all the petrol and electric cars sold in 59 areas across the world in 2015. They connected with information of those areas in the following years and found that the electric vehicles are greener than the new petrol cars. Electric vehicles already have lower net carbon emissions in 53 of those 59 areas. Only in some countries that use coal heavily, such as India and Poland, are electric car emissions worse than those of petrol cars.

The researchers say that the differences between petrol and electric cars on the carbon emissions will grow bigger as power stations get greener. By 2030, they expect the carbon emissions of electric cars to be 20 percent lower than that in 2015, and 30 percent lower by 2050. The suggestions for governments are clear, says Knobloch.“There is no need to wait. Don’t be confused by all those different results out there. It’s a no-regret choice already.”

1. Why did the former comparison show petrol cars more greener?

A．It was too simple.

B．It had no scientific basis.

C．It lacked experimental evidence.

D．It lacked enough reference objects.

2. How many areas do electric cars have higher net carbon emissions?

A．6.

B．53.

C．59.

D．112.

3. What can we infer from the last paragraph?

A．Petrol cars will be fully replaced.

B．The carbon emissions of electric cars will be zero.

C．Power stations will get huge advance technologically.

D．Petrol cars’ pollution will force people to buy electric cars.

4. What is the purpose of the text?

A．To state the development of electric cars.

B．To tell readers how to choose an electric car.

C．To show electric cars are greener than petrol cars.

D．To state the differences between petrol and electric cars.

2 . E-bike, powered by an electric motor in addition to your pedaling, is growing faster than any other kind of bikes these days. Before you go on your next two-wheeled adventure, make sure you’re familiar with the ins and outs of bicycle safety.    1    

Many of the safety recommendations are the same for both types of bikes.    2    Wear a helmet. Make sure you’ re visible to motorists (some e-bikes now come with lights). Don’t talk on the phone, text, or listen to music. And if you’re an e-bike rider, pay attention to these tips too:

•    3    That starts with checking that the tires are inflated and the brakes are working properly. If the bicycle hasn’t been used for a while, take it for a tune-up before you take it for a ride. “For an e-bike, also make sure your battery is charged,” says Ash Lovell, electric bicycle policy director at People for Bikes, a cyclist advocacy organization. And before and after every ride, check your bicycle for damage.

•    4    This is important for e-bike riders. “With the ability to go faster comes the responsibility to know when you should slow down,” says Lovell.

•Know the rules of the road. “When you’ re riding in the street, even in a protected bike lane, read the signals, pay attention to the lane markings, and check the signage to see where e-bikes are allowed,” Lovell says.    5    Signs in those states may specify which types of bikes are allowed on which roads and paths. Check the People for Bikes website( peopleforbikes. org) for more information.

A．Be aware of your speed.

B．Be sure your bike is ready to ride.

C．Guarantee your bike is empowered to go further.

D．Ride with the flow of traffic rather than against it.

E．This will provide you with more practicality and more fun.

F．Thirty-six states have adopted a classification system for e-bikes.

G．This holds true whether you’re riding a traditional bike or an e-bike.