协助扩散中需要特异的膜转运蛋白完成物质的跨膜转运，根据其转运特性，该蛋白又可以分为（）和（）两类。
参考答案：载体蛋白；通道蛋白
臭氧层破坏可导致
A．气温升高、海平面上升、病原体加速繁殖B．皮肤癌、白内障等疾病发病率上升C．眼睛刺痛、流泪、咽喉痛D．呼吸系统疾病、肺癌的发病率上升E．湖泊中水生生物死亡、建筑物腐蚀、森林枯萎
Which of the following statements best summarizes the main idea of passage a. Nuclear energy is environmentally friendly. b. Nuclear energy is indispensable to mankind. c. Fossil fuels cause pollution to the ecological environment. d. Governments are divided in their energy policy.
