—Have the students in Yushu returned to school yet?

—It is reported on TV that ______.[ ]

A. the weather is becoming better

B. most of the factories were destroyed

C. people have given lots of money to them

D. all the schools have started lessons again

胸外按压法进行触电急救时，按压速度为（）。

A、20次/min

B、50次/min

C、80次/min

D、90次/min