①树丛中露出轮廓。②神像上蒙上蜘蛛网。
下列有关遗传信息传递的说法,正确的是( )
将有“┎”形的装片放在载物台上,在显微镜下观察到的物像是‘┒’.
Now the air in our city is _______ than it used to be. Something must be done to stop it.