合成免疫球蛋白的细胞是（） A.中性粒细胞 B.淋巴细胞 C.单核巨噬细胞 D.浆细

泰国的平原地区、阿根廷的潘帕斯草原、美国的中部平原、澳大利亚的墨累——达令盆地四地的农业地域类型分别是（ ）

A．季风水田农业、混合农业、大牧场放牧业、商品谷物农业

B．季风水田农业、商品谷物农业、混合农业、大牧场放牧业

C．商品谷物农业、混合农业、大牧场放牧业、季风水田农业

D．季风水田农业、大牧场放牧业、商品谷物农业、混合农业

海绵窦血栓性静脉炎常为下列哪些疾病的并发症？

A.鼻疖

B.眶内脓肿

C.蝶窦炎

D.眶内蜂窝织炎

E.颅内脓肿

Making group purchases of famous local products and cosmetics (化妆品) with co-workers has become a common habit for the nine-to-fivers. But if your impression of group buys is still a piece of paper being passed around the office, everyone writes their details down, or endless phone calls or faxes to the supplier, then I’m sorry to say you’re behind the times. The popular way to make such purchases today is to get on line, form a special “group” and shop together. Not only can you save money by getting the best discounts, but it’s also a great way to meet new people.

“You could cut off my clicking finger and I’d still keep shopping this way!” so goes a common comment left by customers of China’s famous e-commerce website “Taobao”. Some even refer to group purchasing as a “path of no return”, saying that “Once you’ve tried it, you’ll get hooked!”

The origins of this new trend can be found in China’s well-known online consumers’ BBS, 55BBS, and the shopping boards. Since most BBS users are “white-collared workers and students who live in concentrated areas, buying clothes, food, and so on as a group saves on delivery costs as well as – if they meet the seller’s criteria (标准) – earn gifts, discounts, and frequent shopper points.

Users of this online group shopping boards purchase a lot of different items, from Japanese and Korean style clothes and Ugg boots, through fake eyelashes (假睫毛), stockings, food seasonings (调味品), and kitchen knives, to cosmetic masks and online college courses. All kinds of things have people coming together in groups to buy them, and the pickups are often organized on college campuses or office buildings.

Internet observer Liu Chenxi points the purchasing behavior that these online groups’ power creates a “team” effect. Unlike e-commerce sites driven by individuals’ purchases, sites that create this team effect have users that come together to achieve a common goal. The Internet has made this joining of forces to form group buying power possible, and it continues to snowball all around us.

68. The passage mainly deals with _________.

A. group purchases with co-workers    

B. online group purchases

C. how to do shopping online             

D. buying famous local products and cosmetics

69. What does the word “hooked” in Paragraph 2 probably mean?

A. excited               B. lost                   C. addicted           D. bored

70. According to the text, this kind of purchase has some benefits EXCEPT________.

A. earning gifts                                         B. making new friends

C. saving money                                D. saving time

71. What can we infer from the text?。

A. Online group shopping will become more and more popular.

B. The goods are usually delivered to each doorstep.

C. Doing shopping online is not reliable.

D. People prefer to do group purchases with their co-workers.

从问题的产生到假设的形成可以分为怀疑-问题-假设3个阶段。

下列脑囊虫病CT特点的描述，错误的是：（）

A.多发钙化型：钙化周围水肿明显，增强扫描呈明显强化

B.多发小囊型：在半球区有多发散在小圆形或卵圆形低密度影

C.多发结节型：增强扫描低密度影出现结节或环状强化

D.单发大囊型：脑内圆形、椭圆或分叶状的低密度影

E.急性脑炎型：全脑肿胀，脑室小，增强扫描无强化