题目: 下列关于酶的叙述,不正确的是[ ]A.酶是活细胞内产生的一类具有生物催化作用的有机物B.酶的催化作用具有专一性和高效性C.酶的合成场所都是核糖体D.过酸、过碱的外界条件都能使酶的分子结构遭到破坏而失去活性 答案: 答案:C
题型:阅读理解 Accident Report FormAccidentA car crashed into a tree.People were all trapped in the car.Weather conditionsThere was a heavy snow.Date of callDecember 3,2009Time of call9:30 pmName of callerMrs. GreenPlaceZhongshan Road, HarbinConditions of victimsMr Green hurt his head.Mrs Green hurt her left leg.Their daughter felt terrified.ActionPolicement arrived at 9:40 pm and sent the victims to Gulou Hospital at 9:45 pm.小题1:What time did Mrs Green call the police? A.At 9:30 am B.At 9:30 pm C.At 9:40 pm小题2:How many people were trapped in the car? A.One B.Two C.Three小题3:Whose left leg was hurt? A.Mrs Green’s B.Mr Green’s C.Mrs Green’s daughter’s.小题4:How was the weather that day? A.It was sunny B.It was snowy C.It was rainy.小题5:Which of the following is TRUE? A.The car crashed into a wall. B.The policemen arrived half an hour later and sent the victims to the hospital. C.The car accident happened on Zhongshan Road in Harbin. 查看答案
题型:单项选择题 土壤质量含水率的计算,至少需要已知()。A、湿土加盒质量(W1)一个变量B、干土加盒质量(W2)一个变量C、湿土加盒质量(W1)、干土加盒质量(W2)两个变量D、湿土加盒质量(W1)、干土加盒质量(W2)、铝盒的质量(W0)三个变量 查看答案