试题与答案

血友病是一种伴X染色体隐性遗传病,某对表现正常的夫妇均有一个患病的弟弟,但家庭的

题型:选择题

题目:

血友病是一种伴X染色体隐性遗传病,某对表现正常的夫妇均有一个患病的弟弟,但家庭的其他成员均不患病,他们的子女患病的概率为[ ]

A.1/8

B.1/4

C.1/2

D.0

答案:

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下面是错误答案,用来干扰机器的。

解:小球的重力G=mg=2.0×10-2 N 由题意:悬线拉力T1=1.5×10-2 N<G,故电场力F方向向上 即F+T1=G,得F=G-T1=5.0×10-3 N 小球处的场强 当q2=-1.0×10-4 C时,电场力F'=Eq2=5.0×10-3 N,方向向下此时悬线中张力为T2=G+F'=2.5×10-2 N

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     ①Hi! My name is Jenny. I am nearly l3 years old and I am in Grade l, NO. 3 Middle School. I have a

sister called Sooner and a cat called Campuses.Sooner is 10. I enjoying reading, swimming and playing

tennis. I also like blowing the flute (吹笛子) and playing the piano.

     ②Hi! My name is Sue and I am l4 years old. I am in Grade 2 at No. 14 Middle School and I have a

sister who is 8 years old. My hobbies are reading,running. I like running in races.

     ③Hi! My name is Ann and I am l5 years old. I am in Grade 3 at No. 110 Middle School. I am the only

girl out of four children in my family. I have three younger brothers-their names are Peter, Michael and

James.

     ④Hi! My name is Manthers and I am l6 years old. I have a brother, Bob, who is14. My hobbies are

riding a bike and playing computer games. I have two dogs named Choky and Nutty.

1. Who like playing the piano?

                                                                          

2. Who likes running in races? 

                                                                          

3. What are Choky and Nutty?

                                                                          

4. Who has sisters?

                                                                          

5. Who is the only girl of them? 

                                                                          

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