单项选择题

A．The local Africans are peace-loving people.
B．Soda bottles are very precious in some remote areas.
C．A trivial thing may sometimes bring about undesirable consequences.
D．Caution must be taken in introducing new technology.

A.The
B.
B．Soda
C.
C．A
D.
D．Caution
E.

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1.动脉血二氧化碳分压升高引起呼吸加强的主要机制是（）丨2.低氧对呼吸的兴奋作用是（）

A.刺激外周化学感受器
B.刺激中枢化学感受器
C.直接作用于呼吸中枢
D.刺激肺牵张感受器，
E.刺激脑桥调整中枢

单项选择题

听力原文：M: What kind of father am I? My only son almost died, and I didn't even know he was ill.
W: Don' t blame yourself. You were too busy to pay attention to him. If his mother was still alive, things would have been much better.
Q: Why does the man blame himself?.
(18)
A．At the airport.
B．In a travel agency.
C．In a hotel.
D．At the reception desk.

A.
W:
B.
Q:
C.
(18)
A．At
D.
B．In
E.
C．In
F.
D．At
G.