以芽殖为主要繁殖方式的微生物是()
A.细菌
B.酵母菌
C.霉菌
D.病毒
E.以上都错
参考答案:B
Just a month before the earthquake the school practiced an emergency drill showing the children how to ________ find their “safe place”.
A.calmly
B.regularly
C.automatically
D.specially
骨样骨瘤由以下哪两部分组成()
A.瘤巢和周围骨质硬化区
B.瘤巢和周围骨质破坏区
C.沙粒样物质和周围骨质破坏区
D.沙粒样物质和周围骨质硬化区
E.瘤巢和沙粒样物质