While searching the internet, you should start by using ____________.

A.until

B.unless

C.while

D.if

lish.

A while

B where

C when

A.spreaded

B.scratched

C.scattered

D.burned

mond ring.

A．spread

B．scratched

C．scattered

D．burned

just pulled out one of my teeth and told me to rest for a __1__. I tried to say something, but my mouth was full of cotton wool. He knew I __2__ match boxes and asked me whether my collection was growing. In __3__to his questions I either __4__ or made strange noises. Meanwhile, my tongue was busy __5__ out the hole. I suddenly realized he had pulled out the wrong tooth.

1).

A. answer

B. nodded

C. searching

D. while

E. collected

2).

A. answer

B. nodded

C. searching

D. while

E. collected

3).

A. answer

B. nodded

C. searching

D. while

E. collected

4).

A. answer

B. nodded

C. searching

D. while

E. collected

5).

A. answer

B. nodded

C. searching

D. while

E. collected

阅读理解：根据上下文，补全对话内容。

A. Oh, amazing!

B. Yeah, right. Why？

C. Have you tried Yahoo？

D. you have lots of alternative search engines.

E. you can browse the Internet instead of going to the library.

MOLLY: Zhang, you are going to the library, right？

ZHANG HUA:{A; B; C; D; E}

MOLLY: Why not comfortably stay at home to log onto the Web？

ZHANG HUA: I need to look for some papers to add to my research report.

MOLLY: Well, {A; B; C; D; E}

ZHANG HUA: I tried Baidu for that, but didn't find the ones I need. I need some English papers, actually.

MOLLY: {A; B; C; D; E}

ZHANG HUA: Yahoo？ No, but in my eyes, all search engines are quite similar.

MOLLY: You are right. But Baidu is good for Chinese searches, while Yahoo is better for searching data in English.

ZHANG HUA: {A; B; C; D; E} Never thought of that.4

MOLLY: That's too bad. In fact, {A; B; C; D; E}. Bing, AOL, Ask, Lycos, Sogou and even Yandex, to name a few.

uldn't it？

New "fake fat" products appeared on store shelves in the United States recently, but not everyone is happy about it. Makers of the products, which contain a compound called olestra, say food manufacturers can now eliminate. Critics, however, say the new compound can rob the body of essential vitamins and nutrients (营养物) and can also cause unpleasant side effects in some people. So it's up to consumers to decide whether the new fat-free products taste good enough to keep eating.

Chemists discovered olestra in the late 1960s, when they were searching for a fat that could be digested by infants more easily. Instead of finding the desired fat, the researchers created a fat that can't be digested at all.

Normally, special chemicals in the intestines(肠)"grab" molecules of regular fat and break them down so they can be used by the body. A molecule of regular fat is made up of three molecules of substances called fatting acids.

The fatty acids are absorbed by the intestines and bring with them the essential vitamins A, D, E and K. When fat molecules are present in the intestines with any of those vitamins, the vitamins attach to the molecules and are carried into the bloodstream.

Olestra, which is made from six to eight molecules of fatty acids, is too large for the intestines to absorb. It just slides through the intestines without being broke down. Manufacturers say it's the ability to slide unchanged through the intestines that makes olestra so valuable as a fat substitute. It provides consumers with the taste of regular at without any bad effects on the body. But critics say olestra can prevent vitamins A, D, E and K from being absorbed. It can also prevent the absorption of carotenoids(类胡萝卜素), compounds that may reduce the risk of cancer, heart disease, etc.

Manufacturers are adding vitamins A, D, E and K as well as carotenoids to their products now. even so, some nutritionists are still concerned that people might eat unlimited amounts of food made with the fat substitute without worrying about how many calories they are consuming.

We learn from the passage that olestra is a substance that______.

A．contains plenty of nutrients

B．renders foods calorie-free while retaining their vitamins

C．makes foods easily digestible

D．makes foods fat-free while keeping them delicious

A.contains plenty of nutrients

B.renders foods calorie -free while retaining their vitamins

C.makes foods easily digestible

D.makes foods fat -free while keeping them delicious

_________

[A] searching

[B] strolling

[C] crowding

[D] wandering