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Do you want to have a mobile phone? Have you had a mobile phone already? Nowadays more and more students have their own mobile phones, and mobile phone use has become a problem for middle schools. Some middle schools in China have banned students from carrying mobile phones during school hours. Mobile phone use among children has become a big problem for the school this year. Some children have got mobile phones as birthday gifts, and more students want them. Wang Pi, an official, said, “Mobile phone use is a distraction (分散注意力的东西) to students during school hours and it also gives teachers so much trouble in their classrooms.” Teachers were also saying that sometimes students might use phone messages to cheat during exams. Wang Pialso said some schools had tried to ban mobile phones, but some parents felt unhappy because they couldn’t get in touch with their children. Many teachers said students should not have mobile phones at school, but if their was a good reason, they could leave their phones at school offices. They also said there were many reasons why the students should not have mobile phones at school. They were easy to lose and were a distraction from studies. Many people say that they understand why parents would want their children to have phones, but they think schools should let the students know when they can use their mobile phones. 小题1:Some middle schools have banned students from carrying mobile phones . A.because they are students B.because they don’t earn money C.when they are at school D.when they are free 小题2:Some parents felt unhappy because they couldn’t during school hours. A.help the teachers with their work B.leave their mobile phones at school offices C.use their mobile phones D.get in touch with their children 小题3:The three underlined words “they” in Para. 5 refer to . A.teachers; students; mobile phones B.teachers; mobile phones; students C.students; teachers; mobile phones D.students; mobile phones; teachers 小题4:The passage tells us that . A.it is impossible to ban students from using mobile phones at school B.some parents felt unhappy because they couldn’t use their phones at school C.students shouldn’t have mobile phones at school except for some special reasons D.parents should teach their children how to use mobile phones during school hours
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【单选题】下列说法中错误的是( )
A.
一个关系模式可表示为:关系名(属性1,属性2,…,属性n)
B.
关系模式表示了关系中的数据
C.
关系模型的结构是二维表的结构
D.
关系模型的数据操作是集合操作,操作对象和操作结果都是关系,即若干元组的集合
【单选题】下列关于人类遗传病的叙述,正确的是
A.
遗传病是指基因结构改变而引发的疾病
B.
具有先天性和家族性特点的疾病都是遗传病
C.
杂合子筛查对预防各类遗传病具有重要意义
D.
遗传病再发风险率估算需要确定遗传病类型
【单选题】非法经营罪是指违反国家规定实施的国家限制或者禁止经营的、扰乱市场秩序、情节严重的倒卖行为。根据以上定义,下面选项中不属于诈骗罪和职务侵占罪,但构成非法经营罪的是( )
A.
浙江省某市某区王某注册了“鑫源经贸有限公司”,采用销售提成和发展下线提成等方式,组织、吸收全国各地9800余名营销员,进行服饰、保健品、皮具、健身器材等商品的传销活动,传销额达千万余元
B.
东北的杨某在网上注册成立了一家化妆品批发及零售公司,现在拥有网上注册会员10000多名,这些会员大都在网上订货,并通过银行转账方式交款提货
C.
北京的陈某和李某,通过在商场及街头散发传单等宣传方式,为一家并不存在的美容院做广告宣传,骗取200多名女性成为他们的会员,通过收取入会费获利18000元
D.
学校图书馆的老师,私自将国外捐赠的珍贵图书拿出去卖,获利八千多元
【单选题】下列关于人类遗传病的叙述正确的是()
A.
染色体异常病可通过镜检来诊断,而由基因突变引起的疾病都不可通过镜检来诊断。
B.
苯丙酮尿症的病因体现了基因通过控制酶的合成来控制代谢,进而控制生物的性状。
C.
单基因遗传病是由一对等位基因控制的遗传病,如并指、软骨发育不全等,都是由常染色体上的显性基因控制的遗传病,所以他们都是常染色体病。
D.
不携带致病基因的个体不会患遗传病。
【单选题】下列关于人类遗传病的叙述正确的是( )
A.
单基因突变一定导致遗传病
B.
染色体结构的改变一定导致染色体病
C.
近亲婚配可以增加隐性遗传病的发病风险
D.
环境因素对多基因病的发病无影响
【简答题】阅读下列材料: 材料一:与其等农民自下而上起来解放自己,不如自上而下解放农民 ­ ——二世 1856 年 3 月的一次讲话 材料二:农民还有权赎买他们所住的房屋,并在获得地主同意后,赎买分配各他们长期使用的土地和其附属地作为私产......因为赎买了土地,他们就摆脱了对地主的义务,而成为拥有私产的完全自由的农民。 ——二世签署的废除农奴制度的法令 材料三:农民抱怨......负担的...
【单选题】下列关于人类遗传病的叙述,正确的是
A.
单基因遗传病是由一个基因控制的遗传病
B.
只要没有致病基因,就一定不会患遗传病
C.
具有先天性和家族性特点的疾病都是遗传病
D.
产前诊断一定程度上能预防21三体综合征患儿的出生
【单选题】关于指鼻试验,下列叙述哪项不正确?
A.
嘱患者前臂外旋、伸直,以示指触自己的鼻尖
B.
先快后慢,先睁眼后闭眼,反复上述动作
C.
正常人动作准确,共济失调患者指鼻动作经常失误
D.
如睁眼无困难,闭目则不能完成,为运动性共济失调
E.
如睁眼、闭目皆有困难者,为小脑共济失调
【单选题】某雄性动物的基因型为AaBb。如图是其一个精原细胞减数分裂过程中的两个不同时期细胞分裂图像 ( 不考虑基因突变), 相关叙述正确的是 ( )
A.
甲细胞称为次级精母细胞 , 基因型为 AaBB,此时 细胞中含 6条染色单体
B.
四分体时期 非同源染色体之间发生了交叉互换
C.
该细胞经减数分裂形成的四个精子,其基因型分別为 AB、 a B、 a b、 a b
D.
该精原细胞经减数第一次分裂形成的另一个次级精母细胞 , 基因型为 Aabb
【单选题】一个精原细胞经过一次减数分裂形成的精细胞数量是
A.
1个
B.
2个
C.
3个
D.
4个
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