题目

Which of the following is right?A.Kitty and her classmates have just been to Shanghai. ↗B.Turn left, you will see City Cinema on your right. ↗C.Which shops are you going to? ↘D.Will we live on another planet in the future? ↘ 答案：【答案】C【解析】能使用降调的句子有：陈述句，特殊疑问句，带命令口吻的祈使句，感叹句等。一般疑问句用升调，反意问句的疑问部分用升调表示一种不肯定。A项为陈述句，用降调；B.祈使句，用降调；D.一般疑问句用升调；C.特殊疑问句用降调，故选C。两个不相等的实数m，n满足m2-6m=4，n2-6n=4，则mn的值为（ ）A．6B．-6C．4D．-4