2. 无( )

A. 　They were found by Border Patrol Ka officials after getting lost.

B. 　 They were arrested for accidental (偶然的) border crossing.

C. 　 They invented a cell phone game called Pokemon Go."

D. 　 They quarreled with their mother and left home for America.

A. 　Most of them prefer to study in private schools.

B. 　 Most of them are younger than other foreign students.

C. 　 Most of them attend graduate school.

D. 　 Most of them are in undergraduate programs.

A. 　 They can make us happy.

B. 　 They can promote our image.

C. 　 They are not necessary.

D. 　 They are what we need.

A. 　 mustn＇t

B. 　 may not

C. 　 can＇t

D. 　 needn’t

A. 　 China is the largest market for valuable commodities.

B. China has built the largest market in the world.

C. 　 China will forbid ivory (象牙) trade by the end of 2017.

D. 　 China sells about seventy percent of the world＇s ivory.

A. 　 Because he often goes out to exercise.

B. 　 Because he always gets up very late.

C. 　 Because he usually has meetings.

D. 　 Because he is oftèn busy writing books.

A. 　 A low-carbon economy.

B. 　 A competitive advantage.

C. 　 Anew international trend.

D. 　 Ahighly internationalized industry.

A. 　 Financial support.

B. 　Caring teachers.

C. 　Help with classwork.

D. 　A welcoming space.