According to a new survey carried out by an American university, learning______ second language can result in_______ increase in the power to learn your native tongue.

A．a; the

B．不填; the

C．a; an

D．the; an

（）的婴儿起先是由大人握着自己的手被动地指物、指卡片，逐渐地过渡到自己听名称能用手指出物或卡片，“阅读”的行为便开始产生了。

A.0～6个月

B.7个月～l岁

C.1～3个月

D.4～8个月