题目

情景交际;(D:david W:Weihua) 从所给选项中选择正确的句子补全对话。（七选五） D：I’m a reporter from News Daily.  1___ was great W：Thank you! D：How did you do such a good job？ W：In order to make it good,I tride my best ,I practiced every day .2__ D：In the past ,you almost never talked to anyone.How did you overcome(克服)it? W：I used to be shy .My mother was very worride about it.3___She encouraged me to take part in speech contest. D：4____ W：At first .I could hardly believe it.But when I realized It was true,I felt excited.I could’t hel 直线l1的倾斜角α1＝30°，直线l1⊥l2，则直线l2的斜率为 [　　] A． B． C． D．