提一桶水上楼，这时手臂上肱二头肌和肱三头肌的状态分别是（ ）
A．收缩，收缩
B．收缩，舒张
C．舒张，收缩
D．舒张，舒张
答案：A
有以下程序： #include ＜iostream＞ using namespace std; class Base { int a; public: Base(int x) { a-x; } void show() { cout＜＜a; } }; class Derived : public Base { int b; public: Derived(int i) :Base(i+1) void show() { cout＜＜b; } }; int main ( ) { Base b(5) ,*pb; Derived d(1); pb=&d; pb-＞show (); return 0; } 运行后的打印结果是 【14】 。
One primary goal of UNESCO is to _____ modern knowledge societies in which all people can participate
in information and knowledge. [ ]
A. make up
B. polish up
C. build up
D. take up
