According to a study carried out by an American university, when you eat has ______ on your mood as ______ you eat.

A．much of as an effect; what

B．much of as an effect; which

C．as much of an effect; what

D．as much of an effect; which

石膏罩面灰的配制方法是先将石灰膏加水搅拌均匀，再根据所用石膏的结硬时间，确定加入石膏粉的数量，并随加拌合。稠度为______cm即可使用。

A．8～10

B．10～12

C．13～15

D．16～18