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A、All phenomena in the universe are the result of the interplay between Yin and Yang.
B、A few general qualities of Yin are: warm, active, dry, sky, and bright.
C、Energy and matter are but two states of a continuum, with an infinite possible number of states of aggregation.
D、Ancient scholars described it in this way: Yin changes into Yang, and Yang changes back into Yin.
A、Protein folding is assisted by intervention of specialized auxiliary proteins called chaperone.
B、Protein folding tends to be modular, with areas of local secondary structure forming first, then coalescing into a molten globule.
C、Protein folding is driven first and foremost by the thermodynamics of the water molecules surrounding the nascent polypeptide.
D、The formation of S-S bond in a mature protein is facilitated by the enzyme protein disulfide isomerase.
E、Only a few unusual proteins, such as collagen, require posttranslational processing by partial proteolysis to attain their mature conformation.
•Read the newspaper article below about business telecard.
•For each question (23-28), choose the correct answer.
•Mark one letter (A, B or C) on your Answer Sheet.
BUSINESS TELECARD INTERNATIONAL
You can use your Business Telecard International at any card phone in the UK. Here is some information about making international phone calls.
You can now phone almost any country in the world, although in some cases you can only call major cities. When you cannot make direct dialling calls, you can ask the international operator to help you. This is more expensive and takes more time, but it may be helpful if you want to speak to a particular person and no one else; in this case you should ask for a “person-to-person” call. Even more expensive is a reverse charge call where the person who receives the call pays.
If the international line is busy, you can reserve a call; explain the number you want and the operator will call you back when the line is free.
You can save money by calling outside office hours, e.g. early in the morning, late at night, and on Sundays. Remember that the time may be different in the country you are calling. International time is based on GMT (Greenwich Mean Time); London is on GMT and Moscow, for example, is 3 hours ahead. There is one problem; change to DST (Daylight Saving Time) for the Summer. In the UK, clocks are put forward one hour in Spring and put back in Autumn, and so London is actually one hour ahead of GMT in the Summer. If you are unsure about the time, the operator-will help you.
You can use your Business Telecard International for domestic calls as well, but there will be an additional charge over the standard rate.
What is the most expensive type of call？
A．Reverse charge call.
B．Through the operator.
C．Direct dial.
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