未知题型 A．It is run by Mrs Winter's husband.B．It hires Mrs Winter as an adviser.C．It gives a 30% discount to all customers.D．It encourages husbands to shop alone.

未知题型 A．A good command of a foreign language.B．Preparedness to work hard.C．Outstanding academic results.D．Capability of adapting to a new environment.

单项选择题 有如下C语言程序 void * th_f(void * arg) { printf('Hello World'); pthread_yield(0); } int main(void) { pthread_t tid; int st; st = pthread_create(&tid, NULL, th_f, NULL); if(st==0) printf('Oops, I can not createthread/n'); exit(NULL); } 针对上述程序，下列叙述中哪一个是正确的？