单项选择题

We cannot exploit C and D unless ______.

A．the prices of commodities produced by A and B are raised
B．we export large quantities of commodities produced by A and B
C．the producers in C and D are compensated for the disadvantages under which they operate
D．we allow duties to be paid to the producers in C and D rather than to the government

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单项选择题

The author's main point is that ______.

A．it is impossible to attain national self sufficiency
B．the varying productivity of the various industries leads to the inequalities in wages of workers in these industries
C．a policy that draws labor from the fields of greater natural productiveness to fields of lower natural productiveness tends to reduce purchasing power
D．the government ought to subsidize C and D

单项选择题

The government, when it places high duties on imported commodities of classes C and D,______.

A．raises the price of commodities produced by A and B
B．is, in effect, taxing the workers in A and B
C．raises the wages of workers in C and D at the expense of the workers in A and B
D．does not affect the productivity of the workers in A and B, although the wages of these workers are reduced