【名词&注释】
消费者(consumer)、大气压(atmospheric pressure)、工作人员(staff)、主要因素(main factors)、肺泡表面活性物质(pulmonary surfactant)、打电话(ring up)、肺泡表面张力(alveolar surface tension)、不符合(inconformity)、做什么(do what)、支气管平滑肌收缩
[单选题]下列句子中“焉”字作兼词用，相当于“于之”的是 （ ）
A. 予是焉河伯欣然自喜。
B. 焉足以知是且非邪?
C. 斯天下之民至焉。
D. 危而不持，颠而不扶；则将焉用彼相矣?
查看答案&解析
举一反三：
[单选题]Clerk:Central Ballet. ?Customer: Yes, what's on tonight?
A. Clerk: Sleeping Beauty.
B. May I help you
C. What do you want
D. Can you speak out
E. What's the matter
[单选题]引起肺泡回缩的主要因素是( )
A. 支气管平滑肌收缩
B. 肺泡表面张力(alveolar surface tension)
C. 胸内负压
D. 大气压
E. 肺泡表面活性物质
[单选题]What will scientists do to make sure the poison works this time?
A. They will try some of it themselves.
B. They will use a special kind of poison.
C. They will drain the lake first.
D. They will only put the poison in the wells.
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