胆管结石和急性胆管炎急性发作的典型症状是
A.腹痛、呕吐、高热B.腹痛、呕吐、黄疸C.腹痛、黄疸、腹泻D.腹痛、腹胀、昏迷E.腹痛、黄疸、高热
参考答案:E
A year earlier, Amelia had become the first woman passenger ____ across the Atlantic.
A.fly
B.flying
C.to fly
D.flown
科学家将鱼的抗冻蛋白基因导入烟草和番茄中,从而提高其耐寒能力,这种技术是( )
A.克隆技术
B.转基因技术
C.仿生技术
D.杂交技术