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问题 单项选择题

在下列程序代码中，主程序内调用函数change()时，若参数传递采用传值方式，则主函数输出为 (34) ；若参数传递采用引用方式，则主函数的输出为 (35) 。


A．1

B．2

C．3

D．4

答案

参考答案：D

解析： 若实参a与形参x间信息传递采用传值方式，执行语句b:=x+2，b的值变为3，执行语句x=x+3，x的值变为4，但并没有改变a的值，a依然为1，故输出a+b=1+3_4。
若实参a与形参x间信息传递采用引用方式，执行语句b:=x+2，b的值变为3，执行语句x=x+3，x的值变为4，由于引用调用传递的是实参的地址，那么改变x的值相当于修改a的值，故输出a+b=4+3=7。

阅读理解

Hi! We are Lucy and Lily. We are sisters. We are studying in a high school. We are always wanting the weekends to come. Because on weekends there are different kinds of outdoor activities, such as going to the park, going shopping, playing ball games and so on.

We usually go to the park on Saturdays. We often take some bread, meat, water and milk with us. It’s Saturday today. We are in the park again. Father is fishing in a boat on the lake(湖). Mother is sitting and reading under the tree. We are flying a kite. Now we are drinking some water. Do you think we are happy?

根据短文内容，选择正确答案。

小题1:Lucy and Lily are ________.

A．students

B．teachers

C．nurses

D．cousins小题2:What do Lucy and Lily usually do on Saturdays?

A．Play ball games.

B．Go to the park.

C．Go for a picnic.

D．Go shopping.小题3:How many people can we know from the passage?

A．Three.

B．Four.

C．Five.

D．Six.小题4:What are Lucy and Lily doing now?

A．They are fishing.

B．They are reading.

C．They are flying a kite.

D．They are drinking some water.小题5:Which of the following is NOT true?

A．Lucy and Lily like the weekends.

B．Lucy and Lily often take some food with them.

C．It’s Sunday today.

D．Lucy and Lily’s father is in the park, too.
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单项选择题

表示（）。

A.Y=A+1

B.Y=A+B

C.Y=AB

D.Y=B+1
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