三角片形端生牙
A.鱼纲 B.两栖纲 C.爬行纲 D.鸟纲 E.哺乳纲
参考答案:A
显微镜下看到的像的放大倍数是________和_________放大倍数的____________。
After hours of repair,the driver tried to start the car but it _______ work.
A.won.t
B.shouldn’t
C.wouldn.t
D.couldn’t