搜题请搜索小程序“爱下问搜题”
问题 选择题

如果对某DNA分子进行标记，此DNA分子连续复制四次，那么第四次复制后的DNA中，含有标记链的DNA占　　　　　　　　　　　　　　　　　　　　　[ ]

A．1/16

B．1/8

C．1/4

D．1/2

答案

答案：B

多项选择题

新石器时代的石器造型最常见的有（）

A、刀 

B、斧 

C、凿 

D、锛 

E、镞
查看答案
阅读理解
阅读下列短文，根据短文中的信息完成文后表格。（每空一词)
When we talk about how teenagers are getting worse and worse now, most young people don’t agree. Teenagers always say they are growing up. They can have part-time jobs.They can drive cars.And they can even get married when they’re a lillte bit older.
Their parents say, “ Our children are very good.They like pop music,but they play it in their own rooms.They help in the house.You know they feel bored sometimes because there’s nothing interesting in the neighborhood,no clubs,and no sports.They have nothing to do.
A teacher says that he believes most young people are very kind.He thinks that it’s not bad for young people to like loud music because it can give them lots of energy and make them feel excited .Also, a lot of young people work very hard at school,and they can get good jobs later.
Lewis,a sixteen-year-old boy said, “I have passed all my examinations,but I can’t get a part-time job because older people always think I’m lazy.”
In my opinion, a lot of teenagers are very kind.They belong to community work groups.They help old people,and they also volunteer in local hospitals or primary schools to help look after the sick people and younger students.
Title: 小题1: _▲_ Today
The 小题2: _▲_ teenagers can do
Having part-time jobs;
Driving cars;
小题3: _▲_ married when they are a little bit older.
The reason why they feel 小题4: _▲_
There isn’t小题5:_▲_ interesting in the neighborhood.
The view from their parents
They are good and do some 小题6: _▲_ at home.
The 小题7:_▲_ from one of the teachers
Loud music can make them feel energetic and make them feel小题8:_▲_.
They work hard and can get good jobs later.
Conclusion
They are kind and 小题9: _▲_.They also do voluntary work such as taking care of 小题10: _▲_ and younger students.
查看答案