通常最早提示慢性肾功能衰竭的临床表现是
A．血压升高
B．头痛头晕
C．恶心呕吐
D．皮肤瘙痒
E．呼吸深快
参考答案：C
Strong sandstorms are often _____ you cannot see the sun.
A．so thick that
B．such thick that
C．thick in order that
D．thick such that
隐形眼镜主要的高分子材料是（）
A.聚甲基丙烯酸价值
B.聚碳酸酯
