DNA的遗传信息通过下列何种物质传递到蛋白质生物合成（）。
A.rRNA
B.tRNA
C.DNA本身
D.mRNA
参考答案：D
—Can you describe _____ it happened?
—Yes, I was riding on my bike _____ a car knocked me down from behind.
A．when; as
B．how; as
C．how; when
D．how; while
肾结核来自肾脏血尿的特点是（）。
A.运动后血尿
B.终末血尿
C.无痛性血尿
D.全程血尿
E.初始血尿
