问题 单项选择题

如果进栈序列为e1、e2、e3、e4、e5,则可能的出栈序列是( )。

A.e3、e1、e4、e2、e5

B.e5、e2、e4、e3、e1

C.e3、e4、e1、e2、e5

D.任意顺序

答案

参考答案:B

解析: 根据栈先进后出的特点可知e1肯定是最后出栈的,因此正确答案为选项B。

单项选择题
写作题

假设你叫李华,交了一个外国笔友Smith, 他是一名汉语爱好者。近期他给你发来电子邮件,咨询如何学好汉语。请你结合下面的要点提示,给他回一封电子邮件,就如何学好汉语提出建议。

要多听、多说,可与中国网友(net friends)练习汉语听说;

收看CCTV-9的《学汉语》节目,或进入其网站(http:∥english.cctv.com∕problem∕learnchinese )学习汉语,了解中国文化。

其他你认为合理有效的建议。

注意:词数100左右;开头和结尾已经给出,但不计入总词数;可适当增加情节,并注意连接词语的运用,以使行文连贯,另卷面不清洁者扣两分。

Dear Smith,

I’m glade learn that you are a Chinese lover and want to know how to improve your Chinese learning. Here are some tips for you .

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

                                                                            

I hope my advice will be of help to you.

Yours,

Li Hua