良、恶性肿瘤最有鉴别价值的是
A．化验检查B．X线检查C．生长速度D．病理检查E．生长方式
参考答案：D
It is reported that a small plane from South Africa crashed (坠毁) northwest of Changsha _____ May 28, 2004. [ ]
A. on
B. in
C. to
D. at
生物界遗传密码如何编码有何特点
