问题 实验题

小红的母亲有耳垂、大拇指向背侧弯;父亲有耳垂、大拇指不能向背侧弯曲;小红无耳垂、大拇指能向背侧弯、请你从①有无耳垂②大拇指能不能向背侧弯曲两个方面的特征进行分析(每空2分,8分)

(1)父母有耳垂,小红无耳垂,说明了生物的      现象。

(2)母亲的大拇指向背侧弯曲,小红的大拇指也能身背侧弯曲,说明了生物的      现象。

(3)以上性状中肯定为隐性性状的是       ,肯定为显性性状的是        

答案

父母有耳垂,小红无耳垂,出现了不同于双亲的性状。小红的大拇指也能身背侧弯曲同母亲的性状一致为遗传现象。父母有耳垂,小红无耳垂,有中生无,新生的性状肯定为隐性性状,有耳垂则为显性性状。

阅读理解

阅读下面一篇短文,判断下列句子是否符合短文内容,符合的用“A”,不符合的用“B”。

       Things have changed these days. Many old people complain about how fast things have changed, and they say the things in the old days were better. We all know that is not true. But there are really things have been worse.

       1. A lot of families broke down.

       If husband and wife have serious problems, they no longer stay together like before.  Many children

have only one parent. The parent often has to work for a long time to make money. He can't have enough

time with his child.  Even neither his father nor his mother lives with the child. This is bad for children's

growth.

       2. Too much traffic.

       The cars! No one walks anymore; almost everyone drives. We used to walk to school, walked to

factories, walked to parks, even in winter.  But now we don't. We drive everywhere. We drive all the time. It is bad for our health. And the air of the car pollutes our sky.

       3. We are too busy.

       Mother is busy now. In the old days, mother often stayed at home, cooking the dinner for the children and taking care of the children.  But now they have to work all day.  Father is busier than mother.  

Sometimes children can't see his father for weeks. Children are also busy.

       Life used to be poor and simple, but I can't say all the things are better now.

( )1. We all know that the things in the old days were better.

(     )2. Two bad things in these days are mentioned in this passage.

(     )3. Not all children live with their parents.

(     )4. Only children are not busy in a family.

(     )5. Life in these days is richer than that in the old days.

单项选择题 A1/A2型题