"以病人为中心"的实质是（） A.病人怎么说医生就怎么做 B.病人的观点总是对的 C

有目的地严格控制或创设一定条件，人为地引起或改变种心理现象并加以记录的心理研究方法，叫做

A．观察法

B．调查法

C．实验法

D．教育经验总结法

若基层吸水，或在干热条件下施工，应选择流动性_______的砂浆。

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 4.6 m 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 bires, 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 bires must have done. When the young hoatzins have learned to fly, they lost their claws.

    The drier months between December and March hoatzins fly about the forest in groups of 20:00, but in

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

producing purposes.

1. What is the test mainy 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 babits of hoatzins.

2. Yong 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.

某单位网络的拓扑结构示意图如图5-1所示。该网络采用RIP协议，要求在R2上使用访问控制列表禁止网络192.168.20.0/24上的主机访问网络192.168.10.0/24,在R3上使用访问控制列表禁止网络192.168.20.0/24上的主机访问10.10.10.0/24上的Web服务，但允许其访问其他服务器。

下面是路由器R2的部分配置，请根据题目要求，完成下列配置。

R2#config t

R2(config)#access-list 50 deny 192.168.20.0 0.0.0.255

R2(config)#access-list 50 permit any

R2(config)#inter, face (5)

R2(config-if)#ip access-group (6) (7)

（7）处为（）。

阻光率是透光率的

A．平方
B．方根
C．倒数
D．负数
E．对数