问题 解答题

通过测定下列各种生物细胞色素C,发现与人的差异数如下表所示,请回答问题:

生物种类黑猩猩猕猴
差异数01931523
(1)从上表可知,亲缘关系越近的,细胞色素C的氨基酸组成差异______

(2)上表中与人的亲缘关系最近的是______,人和______亲缘关系最远

(3)你推断它们亲缘关系远近的依据是______

(4)鸟类和哺乳类动物都是由______进化而来的.

(5)通过上表的比较我们这是采用了______方法.

答案

(1)(2)通过上表数据的比较可知:人类与黑猩猩亲缘关系最近,细胞色素C的差异最小是0,人类与蛇的亲缘关系最远,细胞色素C的差异最大是23,说明亲缘关系越近的生物,细胞色素C的差异越小.(3)细胞色素c的氨基酸组成差异大小是推断它们亲缘关系远近的依据 (4)由表中可以看出,鸟类和哺乳类动物都是由爬行类进化而来的.(5)比较法是通过观察,分析,找出研究对象的相同点和不同点,它是认识事物的一种基本方法,是研究动物行为的主要方法.

故答案为:(1)越小 (2)黑猩猩;蛇 (3)细胞色素c的氨基酸组成差异大小 (4)爬行类 (5)比较.

问答题
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There are many festivals in Argentina(阿根廷) during the year. Therefore, you can enjoy the different interesting festivals when traveling there. First of all, we should talk about the Tango(探戈舞) Festival in Argentina, which is held in the capital of this country — Buenos Aires, from February to March. You ought to know that Argentina is the home of tango, so Argentineans admire this dance very much. Even if you cannot dance perfectly, you should join the people and try to perform this dance.

The next festival in Argentina is Open Polo(马球) Tournament. You should go to Palermo to see this festival in Argentina. This festival is held every year and is the most important polo tournament in Argentina. This kind of sport is considered the most important in Argentina. Attending this festival in Argentina, you will be able to communicate with different people, admire the fascinating competition between the teams of different countries, such as Argentina, England, Australia, as well as the US. This festival in Argentina is usually held between November and December every year. So don’t miss the opportunity if you travel to Argentina at this time.

The other festival in Argentina is the Semana Musical Llao Llao. This is a festival of classical music. The festival was created in 1993 and is held at the Llao Llao Hotel, near Bariloche. The festival is held yearly in October. So if you admire this kind of music, you should travel to Argentina in October. There are also many carnivals in October.

There are also many carnivals in Argentina in summer. Of course, it’s impossible to put everything about festivals in Argentina into just one article. We hope that you have found this article interesting and eye-catching.

小题1:What would be the best title for the passage?

A.Travel to Argentina

B.Entertainments in Argentina

C.Festivals in Argentina

D.A brief introduction to Argentina小题2:From the passage, we know that the Tango Festival_______.

A.welcomes everyone to take part in

B.is held in summer

C.is organized by the government

D.holds parties for different dances小题3:Which of the following is a sport festival?

A.The Semana Musical Llao Llao.

B.Open Polo Tournament.

C.The Tango Festival.

D.Argentina Carnivals.小题4:If Tom wants to enjoy a classical music event in Argentina, he should visit _____ .

A.Buenos Aires in spring

B.Palermo in April

C.Bariloche in October

D.Palermo in winter小题5:Which festival is not mentioned in the massage?

A.Tango Festival

B.Open Polo Tournament

C.Argentina Carnivals

D.Argentina Spring Festival