Physics ______ much harder than English, I think. [ ]
A. are
B. is
C. was
D. were
答案:B
小组活动组织形式中,教师观察与指导的主要策略有哪些?
有下列函数定义: int fun(double a,double b) return a*b; 若下列选项中所用变量都已正确定义并赋值,错误的函数调用是( )。
A.if(fun(x,y))……
B.z=fun(fun(x,y),fun(x,y));
C.z=fun(fun(x,y)x,y);
D.fun(x,y);