1 . Cars make our life more convenient． But they can also be a problem， especially fossil fuel（化石燃料）cars， which are a major cause of air pollution．

To improve the environment， many countries are d    1    electric vehicles（EVs， 电动车）． Among them， China is taking a leading role and has created the world's largest EV m    2    ， according to the Wall Street Journal．

Last year， over 40percent of the 753，000EVs sold worldwide were sold in China， more than twice as many as the number sold in the United States， according to the International Energy Agency．

Chinese drivers are already big fans of ECs． Chinese auto companies（汽车公司）i    3    BYD and BAIC（北汽集团）were among the top in the world in EV sales．

"Charging an electric car is cheaper than filling up a fossil fuel car with gas，"said a customer， who bought an electric car from BAIC this year．

However， there are still some problems． It is h    4    to find charging piles（充电桩）． The cars can't go far before they need to be recharged．

S    5    of these problems are being solved， In 2014， China had 31，000charging piles， according to Xinhua News Agency． Now China has the world's largest EV charging network， with more than 167，000charging piles altogether， according to the Economic Daily．

China is trying to make EVs p    6    to reduce pressure（压力）on its environment． The government promised to s    7    increasing carbon dioxide（二氧化碳）．"As China goes， so will the world's auto industry，"the Wall Street Journal said．

2 . "Au pair," originally a French term, refers to a foreigner who lives with a family so he/she can learn the family's language and culture,while at the same time he/she takes care of the family's children and/or cleans the house in return for food,accommodations and a small s    1    .In recent years, many young Chinese have become au pairs in other countries,and many young foreigners have moved to China to work as au pairs．

The magazine ,Women of China recently interviewed three young Chinese, and three foreigners in China, each of whom shared his/her respective experiences as an au pairs.The following is from an au pair called Natalia Martinez Perez, Republic of Colombia.

I am 19 years old, and I come from Cali, a city in the Republic of Colombia.I have good relations with my brother and cousins.I love children, and I consider myself to be a happy person, who is able to make others happy as well.My dream is to travel around the w    2    , and to learn about different cultures and languages.

I saw the beautiful scenery of China and I learned about Chinese culture from m    3    and dramas that I watched.I have always been keen to travel to China since I fell in love with China and its culture.I respect the Chinese culture, and I want to know more about it．

I was an au pair in some other countries before I moved to China in October 2015.When I heard about the opportunity to go to China, via Outuo（OT）International, a Shanghai-based au pair agency, in 2015, I immediately applied.

Now, I live with my host family in Shanghai.The family has a daughter.I have d    4    a good relationship with the girl, her parents and their relatives.The girl says she really likes me.She asks me to tell her a story before she goes to sleep each night.

I teach the girl English after she finishes her homework.I teach her in various interesting ways, and she has developed a great interest in learning English.I cook Colombian food for the girl sometimes, and we also like to go shopping together.

Becoming an au pair has p    5    a good opportunity for me to experience different cultures in different countries.I think I am having an a    6    experience in China.