沥粉描金时,调好的糨糊状大白粉要()装在锥形铁管里。
A、包扎在塑料膜中
B、加入502胶后
C、包扎在铅皮中
D、风干后
参考答案:A
蝗虫在生长发育过程中有蜕皮现象,其原因是( )
A.外骨骼不能随身体生长而长大
B.有利于进行气体交换
C.蜕掉原来的外骨骼使运动更灵活
D.减轻体重,有利于运动
About one in ten computer game players show signs of addictive behavior that have
negative effects on their family, friends and school work , according to a new study.
A.could
B.should
C.need
D.would