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Dear Bill, I’m glad to receive your letter,thank you for your caring for the weather and my health.But I am sorry to tell you that I have to stay at home because of the heavy fog and haze . Since the winter last year,the fog and haze has appeared a lot of times.it has done great harm to our daily life.Many traffic accidents happened just because of the heavy fog and haze weather,more and more people have to go to see the doctor because the serious disease caused by the fog and haze ,quite a lot of flights have to be put off,a great number of people have to stay at home for fear of the poisonous air caused by the fog and haze. According to the Chinese Academy of Science,driving car and burning coal are two main reasons.People have been told : Don’t do outdoor sports;If you have to go out,wear a mask ; wash your face and clean your nose as soon as you get home. People have realized the great harm caused by the fog and haze and the importance of protecting the environment.People all over the country are taking measures to reduce the fog and haze weather.The government suggests people go to work or school with the public traffic, such as the bus and the underground.Also we should plant more trees. According to me, I will go to school by bike or on foot, and I won’t throw the waste anywhere.In addition, I will tell the people I meet to protect the environment as possible as they can.Would you like to tell me some good ideas?I’m looking forward to your reply. Yours, Li Hua 小题1:Li Hua didn’t go to school because___________. A.he was ill B.there was heavy rain C.there was heavy fog and haze D.because it was Sunday 小题2:Which is not mentioned about the harm of fog and haze? A.Many people have to stay indoor B.Many planes can’t take off C.There are more traffic accidents D.Many people have been dead 小题3:What is the meaning of “mask” in Chinese according to the passage? A.围巾 B.毛巾 C.口罩 D.外套 小题4:To stop the fog and haze, which is not true according to the passage? A.Try not to drive cars or burn coal. B.Try not to do sports outdoor. C.Try to take the public traffic D.Call on more people to protect the environment.
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【单选题】下列关于DNA分子和染色体的叙述,正确的是 [     ]
A.
有丝分裂间期细胞中染色体数目不因DNA复制而加倍
B.
DNA在复制过程中可能会发生差错,这种差错一定会传给子代
C.
在减数分裂的四分体时期,染色体交叉互换引起的变异属于染色体变异
D.
处于减数第一、二次分裂的细胞中,染色体与DNA的数目比分别为1:2和1:1
【判断题】个别人未成年人走上犯罪道路绝非偶然。( )
A.
正确
B.
错误
【单选题】科学家在研究蚕豆根尖分生区细胞的有丝分裂周期时,分别用放射性同位素标记胸腺嘧啶脱氧核苷酸()、标记尿嘧啶核苷酸(),把两种核苷酸被细胞利用的速率绘成曲线如图一所示。已知蚕豆根尖细胞有丝分裂周期为20h。培养20h后,根据细胞中的DNA相对含量不同,将细胞分为三组,每组的细胞数如图二所示。下列对结果的分析,不正确的是()
A.
图一中处于ac段的细胞属于图二中甲组细胞,此时RNA聚合酶活性高
B.
图二中乙组细胞处于图一中ce段,此阶段细胞最容易发生基因突变
C.
图二丙组中只有部分细胞的细胞膜从中部向内凹陷
D.
蚕豆根尖细胞有丝分裂周期中,分裂期时间不超过6h
【简答题】保护组织因其来源及形态结构的不同,可分为________和________
【判断题】个别未成年人走上犯罪的道路绝非偶然。( )A. 对 B. 错
A.
正确
B.
错误
【简答题】下图为某高等动物处于不同分裂时期的细胞示意图。据图分析,回答下列问题: (1)甲、乙、丙中表示有丝分裂的细胞是 。甲细胞中DNA、染色体及染色体单体的数目分别是 。 (2)三个细胞都能在该动物体内的 (填器官名称)中找到。乙细胞的名称是 。 (3)丙细胞中含 个染色体组。利用辐射处理丙细胞,可导致染色体断裂失活,这属于 变异。 (4)丁细胞是乙细胞分裂产生的一个子细胞,请在方框中画出与之同时生成的...
【单选题】对于企业管理风险,网络安全只是其中的一个环节,安全性也并不是在任何情况下都是越大越好的。你可以通过一进门就对每一个人进行严格审查的方式来改善一间银行的安全与风险管理,但是如果采取这种做法,会在很大程度上影响到商业利益。因此所有这些企业都在寻找着一个合理的安全的平衡点,这样的局面给另外一些公司和企业开拓了新的市场:为了在执行安全的同时吸引和留住新客户,他们需要根据所处的环境以及他们所从事的行业,来选...
A.
网络交易将走向消失
B.
网络安全的保障是相对的
C.
特定情况下,公司应该放弃网络交易
D.
应该尽最大可能保障网络安全
【多选题】保护组织因其来源及形态结构的不同,可分为
A.
表皮
B.
初生壁
C.
周皮
D.
次生壁
【判断题】意识是人脑这一物质的机能,故意识也是一种物质。
A.
正确
B.
错误
【单选题】下列不属于有丝分裂时期的是( )
A.
前期
B.
粗线期
C.
中期
D.
后期
E.
末期
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