单项选择题
A．现代科学家认为社会本身应该对大部分反对社会的行为负责。
B．现代科学家认为社会本身保护了大部分反对社会的活动。
C．现代科学家认为社会本身在很大程度上应该为反对社会的罪行负责。
D．现代科学家认为社会本身在很大程度上是导致社会罪恶的根源。
单项选择题 The wheel is the simplest yet the most remarkable of all inventions, because there are no wheels in nature -- no living thing was ever created with wheels（）
单项选择题 The purpose of the writer in writing this passage is to（）
单项选择题 When the writer first went to the Red Cross clinic in Beijing to donate his blood he was surprised（）