中 * * 党是工人阶级的先锋队是从（）和（）概括党的性质。
参考答案：阶级性；先进性
—Would you be able to go to the party ?
— I have to pick up my friend at the airport．
A．I’d love to．
B．I’m afraid not．
C．Absolutely!
D．Why not?
上颌神经出颅的位置是
A．卵圆孔 B．圆孔 C．眶上裂 D．眶下孔 E．茎乳孔
