Research indicates that _____ 75% of kids with learning disabilities have such difficulties as making

and keeping friends.

[      ]

A. as much as

B. as long as

C. as many as

D. as far as

商品的内在矛盾有( )。

A．私人劳动与社会劳动的矛盾

B．商品与货币的矛盾

C．使用价值与价值的矛盾

D．具体劳动与抽象劳动的矛盾