问题 填空题 案例分析题

图1是一个常染色体遗传病的家系系谱。致病基因(a)是由正常基因(A)序列中一个碱基对的替换而形成的。图2显示的是A和a基因区域中某限制酶的酶切位点。分别提取家系中Ⅰ12和Ⅱ1的DNA,经过酶切、电泳等步骤,再用特异性探针做分子杂交,结果见图3。

根据图2和图3,可以判断分子杂交所用探针与A基因结合的位置位于()

答案

参考答案:酶切位点12之间(或1.2kb片段)

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As young students, you have many dreams. These dreams can be very big, such as winning the Nobel Prize; they can also be small, such as becoming one of the best students in your class.

Once you find a dream, what do you do with it? Do you ever try to make your dream real?

Andrew Matthews, an Australian writer, tells us that making your dreams real is life’s biggest challenge. You may think you’re not very good at some school subjects, or that it’s impossible for you to become a writer. Those kinds of ideas stop you from realizing your dream.

In fact, everyone can realize his dream. The first thing you must do is to remember what your dream is. Don’t let it leave your heart. Keep telling yourself what you want every day and then your dream will come true faster. You should know that a big dream is, in fact, made up of many small dreams.

You must also never give up your dream. There will be difficulties on the road to your dreams. But the biggest difficulty comes from yourself. You need to decide what is the most important. Studying instead of watching TV will help you to get better exam results, while saving five yuan instead of buying an ice cream means you can buy a new book.

As you get closer to your dream, it may change a little. This is good as you have the chance to learn something more useful and find new hobbies.

小题1:The biggest difficulty on the road to your dreams comes from _____________________.

A.yourself

B.your friends

C.your school

D.your parents.小题2:Which of the following isn’t mentioned in this passage?

A.You may think you’re not good at some school subjects.

B.Making your dreams real is life’s biggest challenge.

C.You must never give up your dream.

D.Listening to English more can help you realize your dream.小题3:.How do you make your dream come true faster?

A. Remember what your dream is.                B. Don’t let your dream leave your heart.

C. Keep telling yourself what you want every day.    D. A, B and C.

小题4: The best title (标题)of this passage is _________________________.

A.How to become a writer

B.How to make your dream real

C.A big dream is made up of small dreams

D.Everyone can realize his dream

多项选择题