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2.在C语言中，以下说法正确的是（ ）。
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3.C语言中while和do-while循环的主要区别是（）。
4.以下程序段（）。int x=-1;do{x=x*x;} while (!x);
5.以下程序的输出结果是（）。#include int main(void){int num=0;while(num<=2){num++;printf("%d",num);}return 0;}
Read the statements. Write T (true), F (false) or DS (doesn’t say).1. Sally says she spends over three hours a day driving.2. Ruth thinks that the streets will be unsafe if driverless cars become a reality.3. Sally believes that driverless cars will benefit the economy.4. Ruth has great faith in technology.5. Sally predicts that people are more likely to share driverless cars.6. Ruth believes that driverless cars will be too expensive for most people to afford.
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