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【单选题】
常见呼吸频率改变选择, 正常成人静息状态下A.
潮式呼吸
B.
间停呼吸
C.
抑制性呼吸
D.
叹息样呼吸
E.
呼吸与脉搏之比为1:4
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举一反三
【单选题】The number of red-crowned cranes is getting ___________.
A.
small and small
B.
little and little
C.
smaller and smaller
D.
less and less
【单选题】The population of China is _____ than that in Australia. [ ]
A.
far more
B.
much larger
C.
much smaller
D.
far less
【单选题】The number of pandas(熊猫) becoming .
A.
is more and more
B.
are less and less
C.
is smaller and smaller
D.
are fewer and fewer
【单选题】According to the talk, what did David Sarnoff predict about radios?
A.
They would get smaller in size.
B.
Their signals would travel further.
C.
They would become less popular than television.
D.
They would be common household items.
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