A.know the meaning of their conversations B.realize that they can communicate with each other C.realize that they can make speeches D.could understand their conversations
单项选择题What can be used as a material to pave roads()
A.The coal by-product. B.Additive. C.Fine-as-powder fly ash. D.Both B and
单项选择题The influenza discovered by a doctor in Singapore is caused by ()
A.a new type of virus B.type A virus C.a sub-group of type B virus D.a virus only existing in Asia