欧美一些标榜“社会主义”的资产阶级改良主义者提出“福利国家”是（）
A.18世纪初
B.18世纪末
C.19世纪初
D.19世纪末二十世纪初
参考答案：D
---Can you guess _________ the new Nike sports shoes?
---Yes. Maybe he asked his grandpa to pay for them, I think.
A．how he paid for
B．where he bought
C．when he bought for
D．why he bought
X线片上牙周膜间隙的正常宽度为（）
A.0.18～0.25mm
B.3～3.5mm
C.2.5～3.5mm
D.1～2mm
E.2mm
