题目

已知 是方程组 的解，则 的值是（） A . ﹣1 B . 1 C . ﹣5 D . 5 答案：A2．听第二段长对话，回答第19至第21小题．19．How does Jack feel today？A．Happy              B．Tired．                  C．Worried．20．What did Jack do on Saturday？A．He played the piano．   B．He visited his friend．   C．He went to the beach．．21．Why did Jack clean his house on Sunday？A．Because he's just moved into a new house．B．Because he cleans his house every Sunday．C．Because he likes to do something for his parents．