题目内容：

    A new algorithm(演算法)raises parking rates in busy neighborhoods and lowers them elsewhere，guaranteeing free parking spots regardless of location，Christopher Intagliata reports.

If you drive in a city，you’ve no doubt experienced the headache of circling block after block，cruising for parking.But scientists who study that phenomenon have a solution to free up more spots:“You make them more expensive，so people have to decide whether to park farther away and Pay less，or closer and pay more.”Itzhak Benenson，a system scientist at Tel Aviv University.

San Francisco has piloted a program that raises parking rates based on demand—and it's been shown to reduce cruising.But the sensors required for those systems can cost millions of dollars to install and operate，Benenson says.So instead，writing in IEEE Intelligent Transportation Systems Magazine，he and his colleague Nir Fulman describe an algorithm that can determine smart pricing，without the use of sensors.

They tested it on the Israeli city of Bat Yam，near Tel Aviv.First，they divide the city into zones.They estimate the parking demand in each zone，by calculating the number of apartments and offices there.Then they take account of parking supply in the area，along with how wealthy potential parkers might be.Using that data，the algorithm suggested pricing for each zone that would guarantee a 90-percent occupancy rate of parking spots city-wide.Meaning 10 percent of spots were always available to drivers willing to pay the price，regardless of neighborhood.

Of course，not everyone will agree that raising parking prices will reduce the press of parking.Last time Benenson proposed hiking rates for city residents?“I got about 100 reactions on the web and 99 of them that said they have never heard such a stupid statement from the professors，and I should be punished and fired.”

Eventually，he says，it'll be up to cities themselves to estimate their residents’political appetites for an easier parking spot.

1.What does the underlined word“them”in paragraph 1 refer to?

A. Parking spots.    B. Parking rates.

C. Busy neighborhoods.    D. New algorithms.

2.How does the new algorithm work?

A. Adopting different parking rates.

B. Counting the apartments and offices.

C. Making farther parking spots more expensive.

D. Setting the price of parking spots with sensors.

3.Which is the process of carrying out the smart pricing?

①Choosing a target city.

②Counting the parking demand.

③Dividing the city into zones.

④Suggesting pricing for each zone.

⑤Considering the parking supply.

A. ②⑤④③①    B. ①③②⑤④

C. ②⑤①③④    D. ①③④②⑤

4.What will the public think of Benenson’s smart pricing?

A. Supporting.    B. Disapproving.    C. Optimistic.    D. Controversial.