溃疡病急性穿孔的典型体征是
A．腹式呼吸基本消失B．腹部压痛最显著的部位C．腹肌强直呈板状D．右下腹柔软，无压痛E．腹胀，肠鸣音消失
参考答案：C
The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.
A．which
B．that
C．across which
D．through which
中药“蝉蜕”是蝉身体的______，一只蝗虫的四龄幼虫已经蜕了______次皮．
