The author argues that a teacher mainly concerns the development of the students'______.

A．Mixed-ability teaching prevents pupils from getting more knowledge.
B．There are more advantages than disadvantages to stream pupils.
C．We should emphasize pupils' academic ability rather than other abilities.
D．Work in groups is helpful to master various abilities.

A．A rise in global temperature less than 1℃ is unlikely to cause enormous lifestyle changes.
B．Global warming would affect many things such as agriculture and people's life.
C．Global warming would lead to rise in the sea level directly.
D．The overwhelming majority share Professor Woug's prediction.