题目内容
4.听第10段材料,回答第17至20题.17.How many languages worldwide are used by less than 100,000 people?
A.About 2,200
B.Over 6,300
C.Over 7,000
18.What's the third most widely spoken language in the world?
A.Hindi
B.Arabic
C.Spanish
19.What do many scientists believe?
A.The brain's drop with age can't be slowed down
B.Speaking another language benefits the brain
C.Exploring other cultures is very important
20.What is the speaker doing?
A.Hosting a radio program
B.Giving a lecture
C.Giving a class.
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