问题 选择题

细胞分化是生物界普遍存在的一种生命现象,下列不正确的是 [ ]

A.老年动物体内也有细胞的分化

B.分化是基因在特定的时间和空间条件下选择性表达的结果

C.愈伤组织的形成是离体的植物细胞分化的结果

D.分化后的不同细胞中mRNA的种类和数量不相同

答案

答案:C

阅读理解

阅读理解。

     Canada is a very large country. It is the second largest

country in the world.  By contrast (比较) it has a very small

population.  There are only about 29 million people ( by the year

1996)there. Most Canadians are of British or French origin, and

French is an officiallanguage of Canada as well as English.  About

45% of the people are of British origin, that is, they or their

parents or grandparents, etc. come from Britain. Nearly 30% are

of French origin. Most of the French-Canadians live in the

province of Quebec.

     Over the years, people have come to live in Canada from

many countries in the world. They are from most European

countries and also from China, besides other Asian countries.

   However, Canada was not an empty country when the

Europeans began to arrive. Canadian Indians lived along the

coast, by the rivers and lakes and in forests. Today there are only

about 350,000 Indians in the whole country, with their own

languages. In the far north live the Inuit. There are only 27,000

Canadian-Inuit. Their life is hard in such a harsh climate.

1. According to the passage, about _____   live in Quebec.   

A.30% of the French-Canadians

B.45% of the Canadians

C. 29 ,000 ,000  people

D. 8 ,700,000 French-Canadians

2. The official languages of Canada are ____.

A. English and Chinese

B. French and English

C.Indian and English

D. Chinese and Inuit

3. The word"origin"in this passage means _____   .

A. 血统    

B. 后裔    

C. 先驱    

D. 猿人

4. Which of the following is TRUE according to this passage?

A. There are 27,000 Canadian-Indians in Canada.

B. More than 13 million people have come from Britain and France in recent years.

C. There are about 30% of the pop.ulation whose parents or grandparents come from France.

D.There are no people when the Europeans began to arrive in Canada.

单项选择题