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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。()

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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

呼吸衰竭最常见的诱因是呼吸道感染。()

In ordinary conversations， participants are expected， first of all， to __________， otherwise，communication would break down.

A. stand straight
B. coordinate
C. speak the truth
D. cooperate