单项选择题

The Agricultural Adjustment Act encouraged American farmers to ______.

A．reduce their scale of production
B．make full use of their land
C．adjust the prices of their farm products
D．be self-sufficient in agricultural production

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单项选择题

It was claimed that the new laws passed during the Roosevelt Administration were aimed at ______.

A．reducing the cost of farming
B．conserving soil in the long-term interest of the nation
C．lowering the burden f farmers
D．helping farmers without shifting the burden onto other taxpayers

单项选择题

To produce artificial noses for practical use, it is essential ______.

A．to develop microchips with thousands of odor receptors
B．to invent chips sensitive to various chemicals
C．to design a computer program to sort out smells
D．to find chemicals that can alter the electrical current passing through