最近,可以抵抗多数抗生素的“超级细菌”引人关注,这类细菌含有超强耐药性基因NDM-1,该基因编码金属β-内酰胺酶,有关此菌耐药性产生的原因,说法正确的是 ①定向突变 ②抗生素滥用 ③金属β-内酰胺酶使许多抗菌药物失活 ④通过染色体交换从其它细菌获得耐药基因
There a basketball match this weekend.( )
will have
is going to be
is going to have
Amanda read the article____,and found something important in it.( )
enough careful
carefully enough
enough carefully
careful enough
Mary invited Tom and Ann to dinner,but____of them came.( )
neither
both
either
none
The car____my uncle had just bought was destroyed in the earthquake.( )
whose
whom
who
which
I don't know when he___,if he ____here,I'll call you at once.( )
A.will come;arrives
B.will come;will arrive
C.comes;arrives
D.comes;will arrive