题目

 I don’t know ________. Could you help me? A. where is his new address                      B. where is his new home C. where his new address is                    D. where his new home is.  答案：D 在△ABC中，∠A＝90°，AB＝AC＝2，则的值为 [　　] A．2 B．4 C． D．－