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【单选题】
低氧对呼吸的刺激作用是通过A.
刺激外化学感受器所实现的反射性效应
B.
刺激中枢化学感受器而兴奋呼吸中枢
C.
直接兴奋延髓吸气神经元
D.
直接刺激呼吸中
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反馈参考答案：
举一反三
【单选题】The Canadian tourist hurried to the station, only _____ that the train had pulled out of the station. [ ]
A.
telling
B.
to tell
C.
to be told
D.
having been told
【单选题】Do you know _____? [ ]
A.
when the train leaves the station
B.
when does the train leave the station
C.
when will the train leave the station
【简答题】NGN的中文全称是( ),英文全称是( )(首字母大写)。
【单选题】By the time we arrived at the railway station, the train _________. As a result, we missed the train.
A.
left
B.
is leaving
C.
had left
D.
leaves
【简答题】阅读理解。 A train stopped at a small station. A man looked out of the window and saw a woman. She was selling cakes. People from the train were buying them. The man wanted to buy a cake, but the woman was...
【多选题】If there is some information about last train, what should station officers broadcast in the station?
A.
Your attention please! The last train to Guanggu Square Station has departed. The last train for Guanggu Square Station departs at 10: 00. Please board immediately.
B.
Your attention please! The train for Guanggu Station is the last train. Please board immediately.
C.
Your attention please! Train service for today has ended. Please leave the station. Thank you for your cooperation.
D.
Your attention please! Prohibit smoking, spitting and scattering rubbish in the station or the train so as to keep these places clean.
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