下列关于程序框图的说法正确的是 [ ] A.程序框图是描述算法的

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问题选择题

下列关于程序框图的说法正确的是 [ ]

A.程序框图是描述算法的语言

B.在程序框图中，一个判断框最多只能有一个退出点

C.程序框图虽可以描述算法，但不如用自然语言描述算法直观

D.程序框图和流程图不是同一个概念

答案

答案：A

补全对话，情景问答

情景交际。

Teacher: You look worried, Paul.

Paul: I am, Ms Mitchell. _ 1

Teacher : You said you liked English. 2

Paul: I can't get the pronunciation right.

Teacher: Well, listening can help. 3 You can listen to them at home and repeat the sentences that are difficult for y6u.

Paul: 4 But what about all the new words?

Teacher: You can always write the new words in your notebook and study them at home or on the way to school.

Paul : 5 Thanks.

A. That might really help.

B. Why don't you listen to tapes?

C. I'm having some trouble learning English.

D. What's the problem?

E. That's a good idea.

1. 2. 3. 4. 5.

选择题

25℃时，某溶液中由水电离产生的c（H⁺）和c（OH^-）的乘积为1×10^-¹⁸，下列说法正确的是

A．该溶液的pH一定是9

B．该溶液pH一定为5

C．该溶液的pH可能是9或5

D．不会有这样的溶液