动物斗殴的行为属于 ( )
A.干扰竞争
B.利用竞争
C.共生
D.竞争排除
参考答案:B
The teacher asked us _______ so much noise.
A.don’t make
B.not make
C.not making
D.not to make
下列号码中哪些表示中国发明专利申请号?()
A.89300472.6
B.ZL85100001
C.89200001.5
D.93100001.7