鱼类的尾鳍形状可分为（）三种

生物分类的依据是   (     )

A．分布的空间、数量

B．性状差异的程度，亲缘关系的远近

C．形体的大小和生活环境

D．形态和结构

属于细菌染色体外遗传物质的结构是

A．核质

B．性菌毛

C．鞭毛

D．质粒

E．中介体

Many animals recognize their food because they see it. So do humans. When you see an apple or a piece of chocolate, you know that these are things you can eat. You can also use other senses when you choose your food. You may like it because it smells good or because it tastes good. You may dislike some types of food because they do not look, smell or taste very nice. Different animals use different senses to find and choose their food. A few animals depend on only one of their senses, while most animals use more than one sense.

Although there are many different types of food, some animals spend their lives eating only one type. The giant panda eats only one particular type of bamboo(竹子) . Other animals eat only one type of food even when given the choice. A kind of white butterfly(蝴蝶) will stay on the leaves of a cabbage, even though there are plenty of other vegetables in the garden. However, most animals have a more varied(多样化) diet . The bear eats fruits and fish. The fox eats small animals, birds and fruits. The diet of these animals will be different depending on the season.

Humans have a very varied diet. We often eat food because we like it and not because it is good for us. In countries such as France and Britain, people eat foods with too much sugar. This makes them overweight, which is bad for their health. Eating too much red meat and animal products, such as butter, can also be bad for the health. Choosing the right food, therefore, has become an area of study in modern life.

小题1:We can infer from the text that humans and animals _________.

A．depend on one sense in choosing food

B．are not satisfied with their food

C．choose food in similar ways

D．eat entirely different food小题2:Which of the following eats only one type of food?

A．The white butterfly.

B．The small bird.

C．The bear.

D．The fox.小题3:Certain animals change their choice of food when ___________.

A．the season changes

B．the food color changes

C．they move to different places

D．they are attracted by different smells

患者女，40岁，因“闭经、泌乳3年，视力减退1年，头痛5个月”来诊。查体：意识清楚；双侧瞳孔等大正圆，直径0.3cm，对光反射迟钝，以左眼为甚，左眼颞侧偏盲，双侧视盘萎缩；双乳有泌乳；四肢、脊柱未见畸形，四肢肌力、肌张力未见明显异常；双侧巴宾斯基征（－）。

治疗策略是（）.

A.溴隐亭

B.化学治疗

C.放射治疗

D.γ刀治疗

E.X刀治疗

F.手术治疗

恶性度最高的甲状腺癌为

A．甲状腺 * * 状腺癌
B．甲状腺滤泡状腺癌
C．未分化癌
D．髓样癌
E．转移癌