She was supposed ______ at home at the moment, but her mother found her in the park.

A．to be reading

B．read

C．reading

D．to have read

18世纪晚期至19世纪末，煤炭在世界能源消费中的比例持续上升的原因是（ ）

A．纽可门蒸汽机的发明

B．改良蒸汽机得到推广

C．电气技术的广泛应用

D．能源消费的日趋单一