题目内容：

    German cities are redrawing road markings to create new cycle paths for the duration of the Covid-19 lockdown, as cyclists demand more space to physically distance on their way to work.

Local authorities in the Kreuzberg district of Berlin trialled（试行）temporary widening of two cycle paths on 27 March, arguing it would help cyclists keep the required 1.5-metre distance apart while car traffic was down owing to Germans' coronavirus（冠状病毒）restrictions.

On Friday, the council declared the plan a success because it had improved cycling safety while not blocking traffic.

The council said it had used removable tape and mobile signs to mark out the widened paths, which can be removed when the current restrictions on movement are lifted.

Residents in 133 other German cities have formally submitted applications for similar pop-up bike paths to their local authorities on the back of a campaign by Environmental Action Germany(DUH), an environmental NGO.

The campaign group cites new research linking air pollution to higher coronavirus death rates as an argument for redrawing road signs across the country. "The coronavirus is showing us that clean air is necessary," said DUH's chair, Jurgen Resch. "It is now especially important to temporarily make it more important for people to move safely on their bikes. This will help improve air quality, enable exercise in fresh air while keeping a safe distance and avoid unnecessary accidents."

In Germany, bike repair shops are allowed to work because of the Covid-19 going on. Three federal states, Berlin, Saxony-Anhalt and Mecklenburg-Vorpommern, have allowed bike shops to stay open.

1.Why did German cities decide to widen temporary cycle paths?

A.To avoid traffic jams. B.To go to work conveniently.

C.To reduce air pollution. D.To keep proper distance between cyclists.

2.How did the road workers sign the widened paths?

A.By using removable tape and signs. B.By painting oil lines.

C.By hanging special boards. D.By pulling up attractive ropes.

3.What does the underlined word "pop-up" in paragraph 5 probably mean?

A.Substituted. B.Limited.

C.Expanded. D.Separated.

4.What can we infer from the last paragraph?

A.Special measures is taken to raise the production of bicycles.

B.All transportation means except bicycling are forbidden.

C.The use of bicycles can stop the Covid-19 from going on.

D.Bicycle riding is encouraged to lower the risk of gathering.