60岁男性，活动中突发头痛，右侧肢体瘫查体：右侧同向性偏盲，右侧中枢性偏瘫，右偏身痛

假设甲、乙、丙、丁四位同学回到了商周时代，请判断哪位同学被封为诸侯王的可能性最小[ ]

A、甲同学成为商朝末年的贵族，带兵抵抗周部落进攻

B、乙同学做了商朝末年的平民，才能、人品俱佳

C、丙同学带兵攻打商纣王，立下汗马功劳

D、丁同学成了西周王族成员，整日无所事事

阅读理解。 

     Along the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly, flies

like a fat chicken, eats green leaves, has the stomach of a cow and has claws (爪) on its wings when young.

They build their homes about 4.6m above the river, an important feature (特征) for the safety of the young.

It is called the hoatzin.

      In appearance, the birds of both sexes look very much alike with brown on the back and cream and red

on the underside. The head is small, with a large set of feathers on the top, bright red eyes, and blue skin. Its

nearest relatives are the common birds, cuckoos. Its most striking feature, though, is only found in the young.

     Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip. Using

these four claws, together with the beak (喙), they can climb about in the bushes, looking very much like

primitive birds must have done. When the young hoatzins have learned to fly, they lose their claws.

     During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30

birds, but in April, when the rainy season begins, they collect together in smaller living units of two to seven

birds for producing purposes.

1. What is the text mainly about? [ ]

A. Hoatzins in dry and rainy seasons.

B. The relatives and enemies of hoatzins.

C. Primitive birds and hoatzins of the Amazon.

D. The appearance and living habits of hoatzins.

2. Young hoatzins are different from their parents in that _____. [ ]

A. they look like young cuckoos

B. they have claws on the wings

C. they eat a lot like a cow

D. they live on river banks

3. What can we infer about primitive birds from the text? [ ]

A. They had claws to help them climb.

B. They could fly long distances.

C. They had four wings like hoatzins.

D. They had a head with long feathers on the top.

4. Why do hoatzins collect together in smaller groups when the rainy season comes? [ ]

A. To find more food.

B. To protect themselves better.

C. To keep themselves warm.

D. To produce their young.

（）属于羊膜动物。

A、鱼纲

B、两栖纲

C、爬行纲

D、圆口纲

阀门产品的型号由7个单元组成，第3单元以一位数字表示阀门的连接型式。4表示（）连接。

A.内螺纹

B.外螺纹

C.法兰

D.焊接

表面修磨的主要常见缺陷有（）

A.坑

B.包

C.变形

D.波浪

E.麻点