人乳中所含酪蛋白与乳清蛋白的比例是多少?
参考答案:4:6
— My car ________ twice this month.
— I'm sorry to hear that. [ ]
A. has been broken in
B. was broken in
C. has been broken into
D. was broken into
简要说明能力发展的个体差异。