发酵目的是（）A.产生新的治疗作用 B.降低毒性 C.清除杂质 D.消除副作用 E. 发布时间：2017-06-03 13:01 │ 来源：www.tikuol.com 题型：单项选择题 问题： 发酵目的是（）A.产生新的治疗作用B.降低毒性C.清除杂质D.消除副作用E.增强疗效
题型：单项选择题 下图表示在某生态系统中，甲、乙、丙三个种群数量变化的相互关系，下列描述正确的是[ ]A．甲为生产者、乙为初级消费者B．“甲→乙→丙”构成一条食物链C．甲与乙、乙与丙为捕食关系D．甲与丙为竞争关系 查看答案
题型：单项选择题 完成对话。Jenny: So, Betty, what does your father do?Betty: 1 Jenny: Do you want to be a policewoman?Betty: Oh, yes. 2 but it’s also an exciting job. Jenny, your father is a bank clerk, right?Jenny: 3 Sam: Do you want to be a bank clerk, too?Jenny: No, not really. I want to be a reporter.Sam: Oh, yeah? Why?Jenny: It’s very busy, but it’s also fun, too. You meet so many interesting people. 4 What does he do?Sam: He’s a report at the TV studio. It’s an exciting job, but it’s also very difficult. 5 I want to be reporter, too. A.Yes, he is.B.Sometimes it’s a little dangerous,C.He’s a policeman.D.He always has a lot of new things to learn.E.What about your father, Sam? 查看答案
题型：单项选择题 关于能源及其利用．下列说法正确的是（ ）A．能源的利用过程实质上是能的转化和转移过程B．煤、石油和天然气是用不完的C．煤、石油和天然气的化学能归根到底来自太阳能D．煤、石油和天然气是一次能源 查看答案
