先天性聋哑是常染色体上基因控制的遗传病,一对表现正常的夫妇生了一个先天聋哑的男孩

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问题:

先天性聋哑是常染色体上基因控制的遗传病,一对表现正常的夫妇生了一个先天聋哑的男孩,若这对夫妇再生一个表现正常的女孩,其可能性是[ ]

A.3/4

B.1/4

C.3/8

D.1/8

考点:人类遗传病
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下列各组词语中,没有错别字的一组是[ ]

A.部署 谛造 蔓延 烟雾缭绕        

B.遗憾  沧桑 枷锁 侧隐之心

C.等侯 桎梏 按键 骇人听闻        

D.辩驳 怜悯 诀窍 安之若素

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社会体育开展的广泛性和社会化程度,取决于全民体育意识和群众体育素养的提高。

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(13分)A、B、C、D、E、F是原子序数依次增大的短周期主族元素,A的最外层电子数是次外层电子数2倍,B是短周期中金属性最强的元素,C是同周期中阳离子半径最小的元素,D元素的最高价氧化物对应水化物与B元素的最高价氧化物对应水化物反应的产物M是制备木材防火剂的原料,E的最外层电子数与内层电子数之比为3﹕5。

请回答:

(1)D的元素符号为           

(2)F在元素周期表中的位置           

(3)用电子式表示由元素B和F组成的化合物的形成过程:                          。(4)B单质与氧气反应的产物与C的单质同时放入水中,产生两种无色气体,有关的化学方程式为                                        

(5)工业上将干燥的F单质通入熔融的E单质中可制得化合物E2F2,该物质可与水反应生成一种能使品红溶液褪色的气体,0.2mol该物质参加反应时转移0.3mol电子,其中只有一种元素化合价发生改变,该反应的化学方程式为

                                              

(6)某混合物的稀溶液中,只可能含有B、C、F构成的简单离子或A、E的最高价氧化物对应水化物所电离出来的阴离子。现分别取一定体积的该溶液进行实验。两次每次取200.00mL进行实验。

实验1:取2mL溶液,向其中加入AgNO3溶液有沉淀产生;

实验2:取200mL溶液,向其中加入足量BaCl2溶液后,得干燥沉淀12.54g,沉淀经足量盐酸洗涤、干燥后,剩余4.66g。

请回答:

①根据以上实验,不能判断是否存在的离子有             

② B的简单离子是否存在?     ;若存在,浓度至少为     mol/L(若不存在,则不必回答第二问)。

题型:选择题

试述发送电子邮件的过程。

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Nowadays, millions of lonely singles are now going online instead. The World Wide Web is quickly becoming the world’s most popular matchmaker(媒人).

Singles are flocking(涌向)to the Internet mainly because their busy lifestyles leave them little time to look for a significant other. Using dating sites(约会网址)is quick and convenient. Many singles say the regular dating scene has just led them from one bad experience to another and are ready to try something else. Dating sites also make it easy to avoid someone you are not interested in. In the real world, however, ignoring someone you don’t like can be difficult.

Despite all the advantages, online dating also presents its own set of problems. People aren’t always those who they declare to be in their online description. Safety is another concern. You are just likely to find a criminal online as you are Mr. or Miss Right.

Online dating experts recommend following a few safety tips:

Guard your personal information. Never give out your personal information online. This includes your last name, phone number, home address and place of work.

Watch for red flags. Do any of the people you are chatting with make disrespectful comments? Do they try to control you? Do they give false information about themselves? If so, forget them!

Meet in a safe place. When meeting someone in person, choose a public location with other people around.

Following these tips and you might be able to find the person of your dreams.

小题1:According to the passage, many lonely singles don’t appreciate the regular dating scene because it is _____________.

A.unpopular

B.troublesome

C.convenient

D.forgettable小题2:The underlined words in the second paragraph “a significant other” means _______”.

A.a true friend

B.a matchmaker

C.a marriage partner

D.a happy family小题3:Which of the following is NOT a suitable place for meeting someone you get to know through the Internet for the first time?

A.At his / her house.

B.At the museum.

C.At McDonald’s.

D.At the bookstore.小题4:From this passage, we can infer that ____________.

A.there are mostly homely and unemployed people online

B.the police had better find criminals online

C.we can find love only through the dating sites

D.following safety tips ensures a safe online dating experience

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