单词:chromatin elimination (seiler 1914)
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DIALOGUE 92 1--Would you like some tea? 2--I'd prefer some coffee, if you've got any. 1--Of course. How do you take it? 2--white with two sugars, please. =================================== 注解: 1)
For many people summer equals tomatoes. Thats when folks can get their hands on gorgeous heirloom and traditional varieties, full of tomatoey flavor. Such tomatoes provide a stark contrast to year-round supermarket ones, famous for tasting like, well
DIALOGUE 64 Coffee Time 1--Would you like some tea? 2--I'd prefer some coffee, if you've got any. 1--Of course. How do you take it? 2--white with two sugars, please. ==================================
This is Scientific American's 60-Second Science. I'm Christie Nicholson . Got a minute? Altruism poses a problem for the theory of survival of the fittest. If we help others at a cost to ourselves, nice-guy behavior should die out, because we are giv
JUDY WOODRUFF:For the first time in two decades, the federal government is making significant changes to the nutrition labels on the food and drinks you buy at the store. Jeffrey Brown sorts through the details and what the changes are designed to do
UNITED NATIONS, March 4 (Xinhua) -- The World Health Organization (WHO) on Wednesday called on countries to reduce sugar intake among adults and children to less than 10 percent of their total energy intake. According to WHO, a further reduction to b