20. The agent was about to sign his name to the document , to his surprise, a stranger broke in to prevent him.
A. while B. when
C. as D. until
20. B考査狀語從句的連接詞。while雖然；when當……時候， 這時；as正如；until直到。句意：代理人剛要在文件上簽字， 這時，讓他驚訝的是，一個陌生人闖進來阻止了他。這里使用了固定結構be about to do when ...意為"剛要做……這時……"，所以選B。
題目來源：2015全品語法快練高中英語新課標 > 訓練2狀語從句
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C
The World Bank says there are about 650 million mobile phone users in African countries in the south of the Sahara Desert. That is greater than the number of users in the United States and European Union.
Samia Melhem works for the World Bank to increase information tech?nologies in Africa. She says mobile phones are the fastest growing technolo?gy in Africa. " This technology is faster than TV and surely faster than electricity. More people have access to mobile phones and Internet today in Africa than they have access to clean water. So we can say that this has been the most important revolution(改革)in terms of changing the African landscape and how people live their daily life.，，
CNN television recently named seven ways of life which have been changed because of mobile phones. They include political activism, educa?tion, entertainment, disaster management, agriculture and health. Another area is banking. Reports say half or more of the adults in Gabon, Kenya and Sudan use mobile money. Rene Mendy sells goods in the streets of Dakar, Senegal. But he doesn't have enough money to open a bank account. Now he uses a mobile phone banking service called Orange Money. With his tele?phone, he can add or take out as little as one dollar. He can make payments and send money to family members who live far away. Orange Money says it serves four million customers in ten countries.
In education, the United Nations agency UNESCO is holding its second Mobile Learning Week in Paris later this month. Conference delegates (代表)are to discuss how the mobile phone use can increase the number of peo?ple who read. Other issues include how mobile technologies can support teachers, and make it easier for girls and women to receive an education.
8. The underlined sentence in Paragraph 2 is written mainly to show that
A.Africans like mobile phones more than clean water
B. clean water is no longer a big problem in Africa
C. Africans don't know what is really important
D.mobile phones and Internet are widely used in Africa
9. According to CNN television, we learn that .
A. mobile phones have brought many problems to the countries in Africa
B. mobile phones have the biggest influence on political activism in Africa
C. mobile phones are more important in Africa than in any other part of the world
D. mobile phones have played an important role in changing Africans' life
10.What do Africans most probably think of the mobile phone banking service called Orange Money?
A. Useless. B. Convenient.
C. Interesting. D. Expensive.
11. What is the United Nations agency UNESCO trying to do?
A. Find more teachers who are willing to teach in Africa.
B. Provide more reading materials on the Internet for mobile phone users.
C. Help Africans receive a better education using mobile phones.
D Prove to the world that mobile phones also have other important uses.
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