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24小时内咯血量在500ml以上为大量咯血。()

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Which of the following can be regarded as a communicative language task？

A. Information-gap activity.
B. Dictation.
C. Sentence transformation.
D. Blank-filling.

部分支气管扩张患者以反复咯血为唯一症状，临床上称为干性支气管扩张。()

The main objective of mechanical practice is to help learners to absorb thoroughly the __________of a language item.

A. meaning
B. function
C. context
D. form

The first P in the PPP teaching model stands for __________ ， which aims to get learners to perceive the form. and meaning of a structure.

A. practice
B. production
C. presentation
D. preparation