问题 单项选择题

下面对I/B类下行名义速率(Down link Nominal Bit Rate)描述错误的是()

A.与调度优先级相关

B.主要用于在线业务请求升速时排队队列调度、拥塞控制等功能

C.在资源拥塞时,名义速率用于体现不同优先级的速率差异化

D.优先级越高,得到的带宽越大

答案

参考答案:A

阅读理解

     Some animals can be trained to help humans. For example, specially trained dogs help blind

people walk around the town safely. Some kinds of monkeys can be taught things too. They can

learn how to help people who can't use their arms or legs. The monkeys pick up the phone when

it rings, carry shopping bags and do housework.

                                                       

     In the wild, animals and humans are not usually friends, but there are a few interesting examples

where they can work together. In Africa, the honeyguide bird works with humans to find food. The

bird likes to eat the grubs (幼虫) - a type of insect that lives inside a beehive (蜂巢,蜂窝). It knows

how to find beehives but it can't open them and get the grubs. People like to eat honey, but they

aren't very good at finding beehives, so the bird and the people help each other. The bird flies to a

beehive and people follow it. When the people open the beehive and take the honey, they give the

grubs to the bird.

                                                    

     In Laguna in the south of Brazil, fishermen and dolphins work as a team. The ocean isn't very

clean, so the fishermen can't see the fish. However, dolphins can find them easily by using sounds.

When the dolphins find a large group of fish, they make a noise to tell the fishermen. Then the

dolphins push the fish to the beach. The fishermen wait in the water near the beach and catch a lot

of fish in their nets. The fishermen's nets make it easier for the dolphins to catch fish too. In Laguna,

fishermen and dolphins have been working together for many years. The fishermen teach their

children how to work with the dolphins. The dolphins must be happy to help because they teach

their babies how to work with the humans!

                                                    

1.How do some dogs help people?

 A. They help people who can't walk.

B. They help people who can't see.

C. They help people who can't hear.

D. They help people who can't carry things.

2. Honeyguide birds help people______.

A. find grubs B. find honey C. open beehives D. make honey

3. How do dolphins help fishermen?

A. They make sounds to send the fish away.

B. They make sounds and then eat the fish.

C. They make sounds and then push the fish to the beach.

D. They make sounds to make the fish jump into the nets.

4. What is the main idea of this article?

A. Animals are our friends.

B. Some animals can help people.

C. Animals are born to help people.

D. Any kind of animals can work with humans.

填空题