按下面长度，A、B、C不在同一直线上的为（） A．AB=5cm，BC=15cm_爱下问搜题

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问题选择题

按下面长度，A、B、C不在同一直线上的为（　　）

A．AB=5cm，BC=15cm，AC=20cm

B．AB=8cm，BC=6cm，AC=10cm

C．AB=11cm，BC=21cm，AC=10cm

D．AB=30cm，BC=16cm，AC=14cm

答案

A、∵AB=5cm，BC=15cm，AC=20cm，

∴AB+BC=AC，故本选项正确；

B、∵AB=8cm，BC=6cm，AC=10cm，

∴AC+BC≠AB，故本选项错误；

C、∵AB=11cm，BC=21cm，AC=10cm，

∴AB+AC=BC，故本选项正确；

D、∵AB=30cm，BC=16cm，AC=14cm，

∴BC+AC=AB，故本选项正确．

故选B．

补全对话，情景问答

给下列的问句选择正确的答语。

( ) 1. What's the time?
( ) 2. What do they do after school?
( ) 3. When are you going to the hospital?
( ) 4. Do you read newspapers?
( ) 5. Shall we go to the museum?
( ) 6. Is there a zoo in your town?
( ) 7. How does your father go to work?
( ) 8. Is your school far away from your home?
( ) 9. What's the weather like tomorrow?
( ) 10. Can you ride a bike?

A. Yes. I sometimes read newspapers.
B. He goes to work by car.
C. No, it isn't.
D. It's going to be snowy tomorrow.
E. Yes, I can.
F. It's ten o'clock.
G. I'm going to the hospital at three o'clock.
H. No, there isn't.
I. They often play football.
J. OK. Let's go.

问答题

计算机网络中，地址解析协议（ARP）用于把IP地址映射为端口地址。