在国际分工和国际贸易方面，李嘉图提出（）。 A.绝对优势原理 B.比较优势原理 C.

以下关于草履虫的知识，正确的是

A．氧的摄入、二氧化碳的排出都通过伸缩泡完成

B．个体微小，要用电子显微镜观察

C．草履虫趋向有利刺激是反射活动

D．观察时，放置儿丝棉花纤维的目的是限制其运动

阅读理解。

    The new iPhone 3G should please everyone. Its look and feel are only slightly improved,

but a faster network loads Web pages more quickly, true GPS functionality allows it to easily

find places nearby, and the new $199 price (down from $400) makes it an affordable luxury.

    Before deciding whether to buy, however, make sure you can actually take advantage of

the iPhone 3G's high-speed data network. 3G stands for third-generation, which in non-geek

speak translates to Web pages and mail messages that, ideally, load about three times faster

than on the original iPhone. Even better, 3G coverage enables you to make a phone call and surf

the Web at the same time. That's great, if you live or work in a place where the 3G network of

AT&T (美国电话电报公司) (the sole wireless carrier of the iPhone) is active. That's not so

great in cities like New York where AT&T's cellular coverage is awful. As one of my colleagues

in New York City, who bought the original iPhone, commented, "It's just a toy. You can't make

phone calls on it, so I carry my Verizon phone with me all the time."

    The real fun begins when you tap on the icon called "App Store" and start browsing the hundreds

of add-on applications that have been developed just for the iPhone. You'll find tons of games (I like

JirboBreak, a free game inspired by the Atari classic Breakout) and mobile versions of popular

websites like Pandora, Facebook, MySpace and the New York Times. Most apps will cost you,

but the vast majority are $9.99 or less. The apps work on the old iPhones too, but you'll enjoy them

a lot more on the iPhone 3G because many of the programs, including Yelp (local business reviews),

Whrrl (mobile social networking) and UrbanSpoon (restaurant reviews), use your exact location-

provided by the iPhone 3G's GPS chip-to make recommendations. The apps also load much faster

over the 3G network.

1. The new iPhone 3G has following features except that _____.

A. It looks and feels better

B. It has a faster network

C. It is easy to locate a place

D. It is too expensive for people to buy

2. Why do one of my colleagues carry Verizon phone with him all the time?

A. Because iPhone 3G is just a toy.

B. ecause he prefers Verizon phone better.

C. Because AT&T's cellular coverage is terrible there.

D. Because Verizon phone enables him make a phone call and surf the Web at the same time.

3. Which of the following statements is NOT true according to the passage.

A. App Store will offer you great fun.

B. many apps have been developed for the iPhone.

C. Most apps are very expensive.

D. Pandora, Facebook, MySpace and the New York Times are popular websites.

4. From the passage we know that the attitude of the author toward iPhone 3G is _____.

A. doubtful

B. appreciative

C. optimistic

D. pessimistic

判断饮用水是否受粪便污染的重要微生物学指标是（）

A、肠道致病菌

B、总大肠菌群

C、耐热大肠菌群

D、菌落总数

患者56岁，绝经7年后出现 * * 不规则出血1个月，妇科检查：右附件区可及直径5cm肿物， * * 脱落细胞学显示雌激素高度影响，宫内膜活检为增生过长。本例最可能的诊断是：

A．右卵巢纤维瘤
B．右卵巢浆液性囊腺瘤
C．右卵巢粘液性囊腺瘤
D．右卵巢皮样囊肿
E．右卵巢卵泡膜细胞瘤

在Windows2000系统下，同时按下Ctrl+Alt+Del的作用是( )

A．热启计算机

B．弹出关闭程序对话框

C．关闭计算机

D．以上都不对