【推荐1】In the past, children walked and rode bikes to and from school and parents seldom worried about their safety.    1    (fortunate),young people today are not free enough to walk and play outdoors    2    many communities have been designed to be    3    (convenience) for cars,not for children.

Our "Kids Walk-to-School" program aims to get children to walk and cycle to and from school in groups    4    (accompany) by adults.This    5    (give) kids a chance to be more physically active and learn more about their environment,and    6    the same time,the program encourages people    7    (make)walking a safe and enjoyable part of everyone's lives.It is also great for anyone living in neighborhoods,and it can also be adapted for children of all    8    (age),especially those    9    live in neighborhoods further from the school    10    those in neighborhoods without safe walking routes.

His days are long, 12 hours crisscrossing the city and     1    (drive) local residents to buy groceries, get medicine and go to the hospital. And     2     roads he travels are mostly empty since the city was sealed off(封闭). In his blue and white car, Zhang Lei is a rare sight on the streets of Wuhan.

During normal times, Mr. Zhang, 32, is a taxi driver in this Chinese city at the epicenter of the outbreak.     3     after the local government abruptly locked down the city late last month, Mr. Zhang became one of the thousands of people who have volunteered to help ease the transportation problems.

Most of his passengers are poor,     4    (elder) residents who don’t have children or     5    family is outside Wuhan and can’t come home because of the quarantine(隔离). “It’s heartbreaking,” he says. “There is no one to take care of     6    (they) .”

The free rides    7    (arrange) by neighborhood committees, which typically serve as a go-between for residents and the local government. In the current crisis, those committees are in charge of allocating community     8    (resource) and helping coordinate with hospitals.

Like other drivers, Mr. Zhang doesn’t get     9     (pay). Many Chinese have praised these volunteer drivers for donating their time and     10     (energetic) to help their fellow residents out.

Volunteer travel involves taking a trip     1     all or part of the purpose is to participate in an arranged service opportunity helping others. Usually, these trips are arranged by church organizations, human interest groups,     2     non-profits.

Charitable interests often go far beyond national     3    (boundary) and sometimes, donating money is not enough     4     (satisfy) the need to help. Volunteer travel is a way to combine a visit to a new location with meaningful work that has a direct impact     5     communities in other parts of the world.

This type of travel has been     6     option for many years.     7     (historic), church groups made up a large part of this market. Once a year a religious organization would organize a trip to another country. The primary purpose of the trip was very specific. For example, it would be to help build a school, dig wells or engage in hundreds of other projects that would impact those less fortunate.

As international travel becomes by far     8     (easy), volunteering in other countries has become as     9     (access) as browsing a website and signing up. This sort of volunteer travel     10     (refer) to as voluntourism or vacanteerism from time to time.

The novel coronavirus, which    1    (origin)in the Chinese city of Wuhan and has now spread to 12 countries, has much in common     2     seasonal flu. They are both viral infections, share similar symptoms and crucially can spread from human to human. In the midst of flu season in much of the northern hemisphere,    3     (tell) the difference between the two will be vital in stopping its spread.

Human coronaviruses, of     4    there are four, can cause infections similar to flu: while many symptoms are mild, both can lead     5     pneumonia （肺炎）and become lethal（致命的）. However, the novel coronavirus（新型冠状病毒） is     6    (serious) than a "typical influenza infection," says Ian Jones, a professor of virology at the University of Reading.

While the mortality rates and symptoms of flu and novel coronavirus may end up being similar, humans'     7    (able) to fight off the viruses differ greatly.

Flu can spread from person to person from up to six feet away,     8    (large) caused by liquid emitted when the inflicted cough or sneeze. Those infected are usually contagious for around three days following the beginning of     9     illness, although this time-frame could stretch to over a week.

All this and more remains a mystery as for the new coronavirus. To understand the virility of the outbreak, Jones urges a focus     10    whether or not international cases lead to secondary infections. "If they don't," he explains, "it would suggest that the virus doesn't transmit quite so well: clearly all the people on the airplane (that traveled from an infected zone) didn't get it."