诊断颅底骨折最可靠的临床表现是
A．意识障碍B．头皮皮下出血C．脑脊液漏D．颅底骨凹陷E．脑脊液含血
参考答案：C
There is a new problem________in the popularity of private cars that road conditions need improving.
A．involved
B．to involve
C．involving
D．being involved
马尾松是一种常见的裸子植物，下列关于马尾松的叙述中，错误的是[ ]
A．叶细长
B．不耐旱
C．根系发达
D．胚珠裸露
