造成我国南北方耕作制度不同的主要影响因素是[ ] A．地形 B．气候 C．水源

一、Write the key words or phrases from memory(默写重点单词与词组)10分

1.风景,山水画_________　                              2.包围,围绕_________

3.海湾_________                                                    4.海港_________

5.火山_________                                                   6.泉水_________

7.表面,外表_________                                     8.安家,定居_________

9.占有,财产_________                                     10.同意,一致_________

11.婚宴_________                                           12.埋葬_________

13.会议 _________                                                14.关系,联系_________

15.农业的_________                                              16.牲畜_________

17.海边别墅_________                                    18.航行_________

19.输出,出口 _________                                        20.区域_________

有以下程序： #include ＜iostream＞ using namespace std; class sample { private: int n: public: sample () {} sample(int m) {n=m; } sample add(sample s1, sample s2)this-＞n=s1.n+s2.n;return (*this); } void disp () {cout ＜＜"n="＜＜n＜＜end1;} }; int main()sample s1(1)0,s2(5),s3;s3.add(s1,s2);s3.disp();return 0; } 程序运行后，输出的结果是

A．n=10

B．n=5

C．n=20

D．n=15

简述VCD机中MPEG1标准对一桢图象的分割方法。

简述热重分析的特点和影响因素。