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问题 单项选择题

病毒中和抗体的作用是（）

A.阻止病毒释放

B.阻止病毒脱壳

C.阻止病毒的生物合成

D.阻止病毒吸附宿主细胞

E.直接杀死病毒

答案

参考答案：D

解析：病毒中和抗体的主要作用是阻止病毒吸附宿主细胞。

单项选择题

依据《道路交通安全法》的规定，某车辆参加了机动车第三者责任强制保险，在发生交通事故后的，由( )。

A．肇事车主支付抢救费用

B．车辆所有者支付抢救费用

C．保险公司全额支付抢救费用

D．保险公司在责任限额范围内支付抢救费用
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单项选择题

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 Kb/s～512 Kb/s in the reverse direction depending on the distance, 12 000 or 18 000 feet.. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．asymmetric

B．compressed

C．irregularity

D．symmetric
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