基因分离规律的实质是（） A.子二代性状的分离比为3：1 B.测交后代性状的分离比为
题型：单项选择题
问题：
基因分离规律的实质是（）
A.子二代性状的分离比为3：1
B.测交后代性状的分离比为3：1
C.非同源染色体上的非等位基因自由组合
D.等位基因随同源染色体的分开而分离
题型：单项选择题
第二部分：阅读理解（共两节，满分40分）
第一节 （共15小题；每小题2分，满分30分）
阅读下列四篇短文，从每小题后所给的A、B、C、D四个选项中，选出最佳选项,并在答题卡上将该选项涂黑。
In learning a foreign language, one should first pay attention to speaking. It is the groundwork of reading and writing. You’d better try your best to speak. Don’t be afraid of making mistakes. But be careful not to let them keep you from improving the language. While you are doing this, a good exercise is to write – keep a diary, write notes, letters or
articles, then if you can, ask someone to go through what you have written and tell you where is wrong . Many mistakes in your speaking will be easily found when you write. Through correcting the mistakes, you can do better in learning a language.
If you are slow in speaking, don’t worry. One of the helpful ways is by reading, either aloud or to yourself. The important thing is to choose something interesting to read. It can’t be too difficult for you. When you are reading in this way, don’t stop to look up the words if you can guess their meanings or if they have nothing important to do with the sentence. You can do that some other time.
46. From the passage we know the groundwork is ___ while you are learning a foreign language.
A. reading B. writing C. speaking D. listening
47. To improve the language, one has to .
A. pay attention to speaking only
B. try not to make mistakes
C. correct mistakes only
D. keep a diary and write notes, letters or articles
48. When you find some new words in reading, you shouldn’t ___
A. guess their meaning B. go 
on reading
C. stop to look them up in the dictionary D. keep on reading the important sentence
49. The best title of this passage might be .
A. How to Learn a Foreign Language B. How to Improve Reading
C. How to learn Writing D. More reading, .Less speaking