能保护人体防止感染乙型病毒性肝炎的抗体是______。
参考答案：抗-HBs
The English spoken in the United States is only slightly different from ______ spoken in England.
A．which
B．what
C．that
D．the one
（x﹣1）（x+1）（x2+1）﹣（x4+1）的值是 [ ]
A．﹣2x2
B．0
C．﹣2
D．﹣1
The English spoken in the United States is only slightly different from ______ spoken in England.