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19. What entertainment events does the speaker mention?Plays, festivals, debates,and many more fun activities.

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20. What does the speaker tell the students at the end of the speech?They are going to make a decision of their.

s1=0;s2=0;n1=0;n2=0； x=[1,-4,-8,3,10,-9,7,-3,10,8,-5,-2,2,0]; m=length(x); fori=1:m if x(i)<0 s1=s1+x(i);n1=n1+1; else s2=s2+x(i);n2=n2+1; end end 以上程序运行后s1、s2的值分别为

A. 6，8
B. ‘-4,1
C. ’-31，41
D. 1，-4

s1=0;s2=0;n1=0;n2=0； x=[1,-4,-8,3,10,-9,7,-3,10,8,-5,-2,2,0]; m=length(x); fori=1:m if x(i)<0 s1=s1+x(i);n1=n1+1; else s2=s2+x(i);n2=n2+1; end end 以上程序运行后n1、n2的值为

A. 6，8
B. ‘-4,1
C. ’-31，41
D. 1，-4

s1=0;s2=0;n1=0;n2=0； x=[1,-4,-8,3,10,-9,7,-3,10,8,-5,-2,2,0]; m=length(x); fori=1:m if x(i)<0 s1=s1+x(i);n1=n1+1; else s2=s2+x(i);n2=n2+1; end end 以上程序运行后m的值为

A. 0
B. 6
C. 8
D. 14