单项选择题

异步传递模式ATM采用称为信元的（）分组，并使用信道传输。 A.
定长，光纤 B.
定长，双绞线 C.
变长，双绞线 D.
变长，光纤

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Directions: For each numbered blank in the following passage there are four choices labeled [A], [B], [C], and [D]. Choose the most suitable one.
He can continue to support himself and his family _____ he produces a surplus.

A．only if
B．much as
C．long before
D．ever since

单项选择题

HA刺激机体产生的特异性抗体为保护性抗体，NA刺激机体产生的特异性抗体可以抑制病毒的释放和扩散

A．对
B．错