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问题 选择题

—Shall I help clean the kitchen, Mum?

—Thank you.But you ________ it because I can do it myself.

A．mustn't have done

B．wouldn't have done

C．mightn't have done

D．haven't got to do

答案

答案：D

D　[根据上下文判断，说的是客观事实，现在没有必要做。]

单项选择题

Routing protocols use different techniques for assigning (81) to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal (82) . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load (83) can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the (84) across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on (85) .

（83）是（）

A.bracketing

B.balancing

C.downloading

D.transmitting
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填空题 案例分析题

甲图是细胞间信息传递的三种模式示意图，乙图为突触的模式图。

C模式中神经元之间的联系可用乙图表示，在该结构中，信息的传递是（）的（双向或单向），因为⑤（）中的信息物质只能由突触前膜传递到突触后膜，即由前一个神经元的（）释放，作用于后一个神经元的（）的膜。
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