线性需求曲线 Q=4-2P， 则 P=1 时，需求价格弹性(绝对值)等于()
A. 2
B. 1
C. 0.5
D. 0.25
某商品的需求价格弹性系数为0.15，现价格为1.2元，则该商品的价格上涨（ ）元才能使其消费量减少10％。
A. 0.3
B. 0.5
C. 0.8
D. 1.0
What can we know from Principal 2's words？
A. The teacher will try their best to solve the problem.
B. The teachers have no ways to solve the problem.
What might the attitude of boys’ father be to Mrs. Cohen’s talking?
A. He might think Mrs. Cohen's words are important.
B. He might think Mrs. Cohen will waste his time.
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