设某一三部门的经济中,消费函数为C=200+0.75Y,投资函数为I=200-25r,货币需求函数为L=Y-100r,名义货币供给是1 000,政府购买G=50,求该经济的总需求函数。
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Listen to the dialogue twice and decide whether the following statement are True or False.[音频]( ) 1. The boy is a freshman.
A. 对
B. 错
( ) 2. The girl gets lost on campus.
A. 对
B. 错
( ) 3. It is the first day of attending class in college for the girl.
A. 对
B. 错
( ) 4. The boy means freshmen seldom get lost on campus.
A. 对
B. 错