有关人口与环境关系的错误叙述是

A．人口规模超过环境承载能力，会导致生态环境破坏

B．控制人口数量，提高人口素质，是提高环境质量的根本措施

C．人口迁移会影响经济的发展

D．控制人口、保护环境是人类社会可持续发展的关键

--- Do you have any idea why the bus – drivers are on strike?

--- As far as I know, they are ____a pay rise.

A．calling off

B．calling at

C．calling in

D．calling for