在进行信用政策变更时，不仅要考虑边际贡献的变化，还需要考虑现金折扣成本、收账费用和坏账费用等实际发生的费用。
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Section A1
A. .A.A testing system.
B.A monitor system.
C.A measuring system.
D.A control system.
Section A2
A.Car prices.
B.Car services.
C.The company's business.
D.The company's culture.
Section A3
A.It's easy to do.
B.It's challenging.
C.He can get a high pay.
D.He did the same job before.
Section A4
A.She'll meet a friend.
B.She'll take a flight.
C.She'll attend an interview at 5 0'clock.
D.She'll see a doctor before 5 O'clock.
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