To       good relationships with your teachers and classmates, you should learn to be on good terms with them.

A．bring up

B．add up

C．keep up

D．take up

肺泡的损伤会引发肺气肿，这会对全身产生的影响是

A．血液中含氧量低

B．血液中二氧化碳含量低

C．血液中含氧量高

D．没有影响