We are now enclosing our spring catalogue and price list __________ CIF Shanghai.

A、As?about

B、At?about

C、At?for

D、As?for

A、in, for

B、with, of

C、at, in

D、under, with

We are enclosing a full set of copy documents ______this first consignment

A. referring

B. covering

C. regarding to

D. as for

Dear sir,

Thank you for your kind letter of December 11, 2003. We are happy to know that our paper entitled "Purification of Clostridium perfringens phospholipas C (@-toxin) by affinity chromatography on agarose-liked egg-yolk lipoprotein" (Art no. RPP-1265) will be acceptable. We have tried to shorten and revise the manuscript. in line with the suggestion made by one of the reviewers and yourself. I am enclosing duplicate copies of the revised version. In answer to the questions raised by the reviewer, we must admit that we have not tested for lipase activity known to exist in culture of this organism. However, since our purified phospholipase C was found homogeneous by various criteria, we believe contamination with lipase, if there is any, is likely to be slight. In any case, we will test for lipase activity as soon as possible.

As to the second question, we realized that the lipoprotein in affinity adsorbent was attacked by the enzyme to a small extent; a minute amount of phosphorycholine was always detected in the break-through peak. As reported, however, the same column can be repeatedly (at least four times) without losing its affinity for the enzyme.

We still do not know whether or not all of the multiple forms of enzyme are artifacts formed exclusively during isoeletric focusing. But some evidence is now available for the presence of at least two forms of enzyme, which are separable by methods other than isoeletric focusing, i. e. CM--or DEAE--Sephadex chromatography (unpublished data). The clarification of this question is now in progress in our laboratory.

We have accepted all the suggestions penciled in by the reviewer on the original manuscript; the abbreviation SDC has been avoided. Through these revision we have succeeded in shortening the manuscript. by two pages in total, although the page numbers have been kept unchanged. In the revised manuscript. we have put the reference numbers in the right order as requested. We would like, however, to keep the designation of the figures as it was, since we believe the suggestion may be based on a misunderstanding on the part of reviewers. As suggested, we have improved the description of the essential step involved in preparation of the affinity adsorbed (page 6,5th line from the bottom of the original manuscript) as follows; "by centrifuging the mixture at 13,000g for 15 min. to discard the precipitate." I hope that these revisions and the shortened text are satisfactory and that the revised version will be acceptable for publication in Biochimica et Biophysica Acta. I also hope the revised manuscript. will reach you before January 1.

Sincerely yours,

Nobuo Ogata, M.D.

The author wants his paper ______.

A．to be revised

B．to get a prize

C．to be published

D．to be looked through

A、附寄

B、派送

C、关闭

D、派发

A．To enclose

B．Enclosing

C．Enclose

D．Enclosed

Over a year ago, Jamel Balhi, a French young adventurer, made a promise in Paris to his Chinese friend from Shanghai he would【21】to meet him in China and have a cup of tea together. His Chinese friend never【22】that he really meant what he said. To his great【23】the 25-year-old Frenchman reached Shanghai in September【24】after a long journey.

【25】 the young adventurer had covered about 15,000 kilometres of different climates, travelling【26】15 countries. For him, it was a test of【27】and will:

Balhi started his journey on May 30 from Paris. The journey was to be a real test,【28】he had fully prepared.

【29】problem made it very hard for him to ask the way, and it always caused him troubles when he crossed【30】When he was venturing (冒险)【31】desert and the war zone between Iran and Iraq, he was【32】from hunger, coldness and war. At the same time, he had to stay alert (警惕)【33】and safeguard himself against the possible attacks by both animals and robbers.

"I'm lucky enough to arrive in Shanghai safe and【34】a cup of tea together with my Chinese friend【35】I promised last year." he said.

(36)

A．come

B．run

C．fly

D．ride

Heredity(遗传) is not the only thing that influences our color. Where we live and how we live after we are born are important too. For instance, our genes influence how fat or thin we are. But our weight depends mainly upon how much we eat and how much exercise we get. In the same way, our skin color depends to a large extent upon how much sunshine we get.

When summer arrives and light—colored people go to the beaches, some will tan darkly, some will tan lightly and few will not tan at all. Each one has inherited a different ability to tan, but the differences do not appear until the conditions are right. An outdoor man will soon become pale if he changes to an indoor job, while a desk clerk will take on tan after a short vacation in the sun.

Sometimes people decide that being tanned is better than being pale. Sometimes they decide the opposite.

Centuries ago, most of the people in Europe were peasants and they had to work in the fields all day. Noblemen, on the other hand, did not have to work. They stayed indoors and remained pale. You could always tell a nobleman from a peasant because a peasant had a tan. As a result, a shin so pale that the veins (血管) showed was considered a mark of great beauty.

During the Industrial Revolution things changed. Farmers left their fields and went to work in factories, mines and mills. Working for long hours in dimly—lit factories and mines made their skins pale. (77) Wealthy people, however, could afford to travel so sunny countries. They had the leisure to lie around on the beaches and get tan. Having a tan became a sign of wealth.

In Western Europe and North America pale skin is no longer desirable. Instead of bleaching themselves white with lemon juice, many women spend their time under a sun—lamp. The desire for a quick tan has led to the invention of pills and lotions (涂剂) that darken the skin artificially without exposure to sunlight. These pills and lotions can be bought by anyone at any drugstore. A rich man can spend hundreds of dollars on a vacation in the sunny West Indies and get his suntan there. But his lowest—paid clerk can have what looks like the same tan out of a bottle for a few cents.

Besides genes, our skin color has much to do with ______.

A．exercise

B．weight

C．food

D．sunshine