20．He has millions of students from all around the world．They listen to his classes online but never——青夏教育精英家教网—

20．He has millions of students from all around the world．They listen to his classes online but never see his face on the screen．Salman Khan，39，from the US，is the founder of the learning website Khan Academy．
Unlike other online courses that film teachers giving classes，Khan's videos only use his voice and a digital blackboard for writing．He says he doesn't want a human face to distract students．Khan also makes his classes as short as 10to 15minutes so students don't lose interest．They can also earn （获得） points from taking these classes．
The courses are translated into more than 36different languages including Chinese．About 80teachers from the world's top universities are now also teaching on the website．But all this started nine years ago with just one man-Salman Khan．υThese kinds of special courses make Khan Academy one of the world's most popular online education websites．
In 2006，Khan made homemade videos to help his seventh grade cousin with math．He posted the videos online and got thousands of views．This encouraged Khan to make more videos and create his own website Khan Academy．
As a Bangladeshi-American （孟加拉裔美国人），Khan understands that many kids，especially those in developing countries，cannot get a good education．He himself has three degrees （学位） from Massachusetts Institute of Technology and one from Harvard．He wants to use his knowledge to help more people．Thus，his courses are all offered for free．"Our mission （任务） is to provide a free，world-class education for anyone，anywhere，"he said．
Khan's website has not only become very popular worldwide but has also won a lot of respect．Even Bill Gates，the founder of Microsoft，is one of his fans．Gates donated over $1.5million （9.6million yuan） to support Khan and named him the"teacher to the world"．

28．From Paragraphs 1-2，we learn thatB．
A．Khan Academy is only for people in the US
B．Khan Academy is an educational website
C．Khan's courses film teachers giving classes
D．there is a 10to 15minute break between Khan's classes
29．What does the underlined word"distract"mean in Paragraph 2？C
A．麻烦 B．吸引 C．使分心 D．使烦恼
30．How many languages are the courses translated into？A
A.36 B.80 C.9 D.1
31．Which of the following is NOT true？A
A．Khan's cousin came up with the idea for Khan Academy．
B．Khan knows about the educational situation in developing countries．
C．People don't have to pay for Khan's courses．
D．Bill Gates named Khan the"teacher to the world"．

16．这是人类首次认真思考自己的活动对环境造成的影响．（It's the first time； effect）It is the first time （that） humans/human beings have thought seriously about the effect of their activities on the environment．

15．我们可以循环使用课本，以达到节约和减少污染的目的．（recycle； so as to）We can recycle our textbooks so as to save and reduce/cut down pollution．

14．政府必须采取有效措施保护这些历史遗产不受破坏．（protect…from）The government must take active measures to protect these historical relics from being damaged．

13．很抱歉，我不能理解你在会上提出的建议．（make sense；定语从句）I'm sorry．I cannot make sense of the advice （which/that） you raised/put forward in the meeting．

12．随着互联网的普及，网购已经被越来越多的人所接受．（as； on-line shopping）As the Internet becomes popular，online-shopping has been accepted by more and more people．

11．最近我们班就垃圾食品是否对人的皮肤有害展开了一次讨论．（harm n．）Recently our class have/has had a discussion on whether junk food does harm to a person's skin．

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