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问题 单项选择题

投资保险的保险期间分为短期和长期，长期保险期限最短的为( )年。

A．1

B．2

C．3

D．5

答案

参考答案：C

解析： 投资保险的保险期间分为短期和长期两种。短期为1年；长期保险期限最短的为3年，最长的为15年。

选择题

—Would you please ______ my daughter from school for me?

---With pleasure.

A．pick up

B．put up

C．turn up

D．look up
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单项选择题

We have already covered the topic of network addresses. The first （） in a block (in classes A，B，and C) defines the network address. In classes A，B，and C，if the hostid is all ls， the address is called a direct broadcast address. It is used by a.（） to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a （） address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A，B，and C.

In classes A，B，and C，an address with all is for the netid and hostid (32 bits) defines a（） address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However，a router will block a packet having this type ofaddress to confine the broadcasting to the （） network. Note that this address belongs to class E.

In classes A，B，and C，an address with all is for the netid and hostid (32 bits) defines a（） address in the current network.

A．unicast

B．multicast

C．broadcast

D．anycast
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