有如下程序 #include＜iostream＞ using nameSpace std； class base { public： vinual void f1() {cout＜＜"F1 Base"； } virtual void f2(){cout＜＜"F2Base"； } }； class derive：public base { void f1() {cout＜＜"F1Derive"； } void f2(int x) {cout＜＜"F2Derive"； } }； int main() {base obj1，*p；derive obj2；p=&obj2；p—＞f1()；p—＞f2()；return 0； } 执行后的输出结果是

A．F1Derive F2Base

B．F1Derive F2Derive

C．F1Base F2Base

D．F1Base F2Derive

按要求句型转换(共5小题；每小题2分，满分10分)

小题1: They give us some candies as a treat. (改为同义句)

They give us a _______ _______some candies.

小题2: He does some homework at night.（改为否定句）

He ________do_______homework at night.

小题3: My father is a teacher .My mother is a teacher，too.（改为同义句）

My ___________are__________teachers.

小题4:Amy goes to the school library every Wednesday.（对划线部分提问）

_______ _______does Amy go to the school library?

小题5: I help him, he helps me．(改为同义句)

We help _________ _________．