题目

下列关于细胞分化、衰老、癌变叙述正确的是 A．受精卵全能性最高，含有生物体全部种类的蛋白质 B．细胞分化是一种阶段性的变化，在胚胎时期达到最大限度 C．癌变的细胞内呼吸速率降低；衰老的细胞内有些酶活性降低 D．从总体上看，个体衰老的过程也是组成个体的细胞普遍衰老的过程 答案：D根据句子意义选择方框内所给单词或短语的正确形式填空be strict with, on his own, lift off, take part in, graduate from, volunteer, personally mark, celebrate, switch1.Kate ___________________ medical school last year and she is working in a big hospital now.2.The girl’s father __________________ her. He never allows her to go out at night.3.I need a _______________ to help with the cooking.4.China’s first manned spaceship _______________ at 9 a.m. on Wednesday, October 15th,2003.5._________________, I felt sorry for what the boy had done.6.When he was still a child, he had learnt to live ______________________.7.The Lantern Festival ______________ the end of the Chinese New Year celebration.8.The Mid-Autumn Festival is__________________ by Chinese people all over the world.9.We students ________________ after-class activities actively, which are good for our health.10.You should ____________ off TV when your child is doing his homework.