Whether you believe it or not, it is _________ that causes your illness.

A．because of your overweight

B．you are so overweight

C．because you are overweight

D．your being overweight

水稻一生中吸收养分最多的时期是（）

A、秧苗期

B、分蘖初期

C、分蘖盛期至抽穗期

D、成熟期