题目

验证某有机物属于烃，应完成的实验内容是  A．只测定它的C、H质量比       B．只需证明它完全燃烧后产物只有H2O和CO2  C．只测定其燃烧产物中H2O与CO2的物质的量的比值  D．测定该试样的质量及试样完全燃烧后生成CO2和H2O的质量 答案：D  There is an old tiger in the forest (森林). He doesn’t want to look for (寻找) food now. He often lets other animals get him some food to eat. One day, he sees a monkey (猴子) and says,“I am hungry, monkey. Go and get me something to eat.”“I can’t do that now, tiger.” the monkey says,“There is another tiger over there（那边）. He doesn’t let me get anything for you to eat. I am afraid of (害怕) him.” “What?” says the old tiger. “Take me to the tiger. I want to talk to him.” The monkey and the tiger go to the bridge(桥) over the river(河). “Now look down at the water.” says the monkey. “Do you see the tiger?” “Yes, I do.” says the old tiger. “Let me eat him.” Then the tiger jumps(跳) into the river. 1.How many tigers and monkeys are there in the story? A．Two tigers and two monkeys. B．Two tigers and one monkey. C．One tiger and two monkeys. D．One tiger and one monkey. 2.Why do other animals get food for the tiger? A．Because they are afraid of him. B．Because only they can find some food. C．Because they are his friends. D．Because they like to do that. 3.The monkey ________. A．goes to get something to eat B．goes to the bridge with the tiger C．knows there is another tiger D．tells the tiger to jump into the water 4.Which of the following is right(正确的)? A．The tiger is very clever. B．The monkey eats the tiger. C．The tiger eats another tiger. D．The tiger jumps into the water.