《史记》是我国第一部（）通史。

一组数据6，0，4，6．这组数据的众数、中位数、平均数分别是 [ ]

A．6，6，4

B．4，2，4

C．6，4，2

D．6，5，4

可引起 * * 感染的是（）

A.曼氏迭宫绦虫

B.短膜壳虫

C.溶组织阿米巴

D.毛滴虫

E.长膜壳绦虫

阅读理解

    There are literally hundreds of national parks and wildlife areas in Africa that you can travel to. Here

are the top four travel destinations in Africa:

     Tanzania-Serengeti NP

     During the annual migration, when the wildebeests and zebras pack__up and leave their living areas

to find fresher ones, the Serengeti is an astonishing place to be. It's a very good travel spot in Africa at

other times of the year too but the migration has been ranked by many as one of the wonders of the

natural world.

    Kenya-Masai Mara NP

     If you want to see the big cats, this wildlife park is the best of the best. Lion, leopard and cheetah

abound and they are relatively easy to spot because of the grassland vegetation which means you get

good views for miles around. Another big plus is the fact that going offroad is allowed and it is a big

advantage because the animals will rarely oblige you and stay next to the major roads.

     South Africa-Kruger National Park

     For the variety of species no other place in Africa can come close to the Kruger Park. And because

it is so large it has a number of different ecosystems that you can pass through in your search for animals

and birds. It is one of the best managed parks in Africa and the accommodation is wellequipped, too.

     Zambia-South Luangwa National Park

     South Luangwa is a diamond in the rough, just waiting for enough exposure to bring it to its rightful

place in the crown of prime Africa trips. It has been regarded as one of the best places in Africa to see

the special leopard and it is the birthplace of the walking travel.

1. The underlined phrase "pack up" in Paragraph 2 means ________. 

A. rise                              

B. suffer

C. gather                          

D. scatter

2. Kruger National Park is different from the other parks in that ________.

A. there are many kinds of species

B. there are a lot of high trees

C. it is the largest park in Africa

D. the hotels own enough rooms

3. People like South Luangwa National Park because ________. 

A. there is a diamond in the park

B. it is the best park in Africa

C. they can see wildlife on foot

D. it is the best wonder in the world

4. The writer's purpose in writing the text is to ________.

A. tell us something about natural animals

B. discuss some problems in African travel industry

C. persuade more people to travel to Africa

D. introduce to us some top natural parks in Africa

下列哪些因素可导致呼吸性碱中毒（）

A.高热

B.疼痛

C.创伤

D.感染

E.低氧血症

下列不属于计算机网络通信设备的是（）。

A.调制解调器

B.网卡

C.USB集线器

D.HUB