【单选题】Trade can benefit society as a whole because it allows
A.
for a more efficient use of resources.
B.
for goods to be obtained at a lower opportunity cost.
C.
people to specialize in activities in which they have a comparative advantage.
D.
All of the above are correct.
【判断题】A free-trade area removes trade barriers between member countries, but allows the member countries to maintain their own trade barriers against trade with nonmember countries.
【单选题】()是新中国罪犯劳动改造工作的第一部法规。
【判断题】Trade allows all countries to achieve greater prosperity.
【单选题】下列哪个方法不能与方法public void add(int a){}重载()
B.
public void add(double b)
C.
public void add(int a,int b)
D.
public void add(float g)