问题 单项选择题

有关CDC与WHO提出的HIV感染的临床分类法,下列哪项是错误的()。

A.HIV感染临床分为三大类,每类根据CD4+T淋巴细胞数和总淋巴细胞数又可分为三级

B.A类包括急性HIV感染、无症状HIV感染

C.B类为持续性全身淋巴结肿大综合症

D.C类出现神经系统症状,各种机会感染、因免疫缺陷而继发肿瘤及并发其它疾病

E.1级为CD4+T淋巴细胞数>0.5×10/L,总淋巴细胞数>2.0×109/L

答案

参考答案:C

阅读理解

阅读理解。

    In the United States, children between the ages of five and sixteen are required (要求) to attend school

(go to school). In Australia children between the ages of six and fifteen are required to attend school with

the exception of Tasmania. In Tasmania children attend school until the age of sixteen. Kindergarten is

required in the United States, but not in Australia.

    Australia's four-term school year begins in February with a two-week holiday between terms. The fourth

and last term ends on December 20.The Christmas holiday is also with the end of school and the beginning

of the summer vacation (holidays). The students return to school in February. In the United States, children

have their summer vacation from June until August.

    Australia's primary or elementary school includes grades one through to six. Secondary school consists

of grade seven through to twelve. All secondary students wear uniforms to school. Students in public

schools in the United States do not wear uniforms at school.

    Students in the United States eat a hot lunch at school. Australian students do not.

    In Australia large schools are found in cities along the coast. The small schools are located farther out in

the countryside. A teacher in the country may teach all grades, with only one or two students in a grade.

Students living far from the city attend "Schools of the Air".

    They listen to the teacher on the radio each day when it's time for school. Students have their own books.

They answer questions over the microphone, The teacher asks them to do some homework. The completed

homework is mailed to the teacher. It is discussed over the microphone, corrected and mailed back. In the

United States some children attend school at home. Their parents are their teachers!

1. How old are the students in Australia at school? [ ]

A. Between the ages of five and sixteen.

B. Between the ages of six and fifteen.

C. Between the ages of seven and fourteen.

D. Between nine and eighteen

2. Who attends school at age of 16? [ ]

A. The children in the USA.

B. The children in England.

C. The children in Tasmania.

D. The children in Canada.

3. How many grades are there in Australian schools? [ ]

A. 12 grades

B. 9 grades.

C. 10 grades

D.14 grades.

4. Who doesn't wear uniforms at school? [ ]

A. Students in Australia's Secondary school.

B. Students in England

C. Students in the USA.

D. Students in public schools in the USA

5. Where can you find large schools? [ ]

A. In the countryside.

B. In cities along the coast in Australia.

C. In the city.

D. At home.

单项选择题