问题 解答题

观察图并回答问题

(1)a、b分别表示父母的体细胞 他们的染色体数均为______条.

(2)A表示父母分别产生生殖细胞的过程,生殖细胞c、d分别叫______和______,他们的染色体均为______条,比a、b  减少了______.

答案

(1)人的体细胞中含有23对、46条染色体;图示中a、b分别表示父母的体细胞,则他们的染色体数均为46条.

(2)在形成生殖细胞的过程中,成对的染色体分开,每对染色体中的一条进入精子或卵细胞中,因此生殖细胞中的染色体数比体细胞中的少一半,正常人的体细胞染色体数目为23对,因此人的生殖细胞中染色体的数目是23条.

故答案为:(1)46

(2)精子;卵细胞;23;一半

单项选择题
阅读理解

Among various programmes, TV talk shows have covered every inch of space on daytime television. And anyone who watches them regularly knows that each one is different in style. But no two shows are more opposite in content, while at the same time standing out above the rest, than the Jerry Springer and the Oprah Winfrey shows.

Jerry Springer could easily be considered the king of “rubbish talk”. The contents on his show are as surprising as they can be. For example, the show takes the ever-mon talk show titles of love, sex, cheating, and hate, to a different level. Clearly, the Jerry Springer show is about the dark side of society, yet people are willing to eat up the troubles of other people’s lives.

Like Jerry Springer, Oprah Winfrey takes TV talk show to its top. But Oprah goes in the opposite direction. The show is mainly about the improvement of society and different quality of life. Contents are from teaching your children lessons, managing your work week, to getting to know your neighbors.

pared to Oprah, the Jerry Springer show looks like poisonous waste being poured into society. Jerry ends every show with a “final word”. He makes a small speech about the entire idea of the show. Hopefully, this is the part where most people will learn something very valuable.

Clean as it is, the Oprah show is not for everyone. The show’s main viewers are middleclass Americans. Most of these people have the time, money, and ability to deal with life’s tough problems. Jerry Springer, on the other hand, has more of a connection with the young adults of society. These are 18-to-21-year-olds whose main troubles in life include love, relationship, sex, money and drug. They are the ones who see some value and lessons to be learned through the show’s exploitation.

小题1:pared with other TV talk shows, both the Jerry Springer and the Oprah Winfrey are ____.

A.more interesting

B.more formal

C.more detailed

D.unusually popular小题2: Which of the following is likely to be a topic of the Oprah Winfrey show?

A.Family ine planning.

B.Nation hatred.

C.A new type of robot.

D.Street accident.小题3:We can learn from the passage that the two talk shows_____.

A.have bee the only ones of its kind

B.attract different people

C.appear at different times of the day

D.exploit the weaknesses in human nature