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It would be a mistake to think that drugs that have an impact on memory necessary will have an effect on intelligence.
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Dr. Joe Z Tsien is a professor of mloecular biology at Harvard.
听力原文： Most of us have an image of such a normal or standard English in pronunciation, and very commonly in Great Britain this is "Received Pronunciation", which is often associated with the public schools, Oxford, and the BBD. At the same time, it must be remembered that so far as the English-speaking countries are concerned, this "Received Pronunciation" approached the status of a "standard" almost only in England. Educated Scots, Irishmen, Americans, Australians, and others have their own different images of a standard form. of English.
Even in England it is difficult to speak of a standard in pronunciation. Pronunciation is infinitely variable, so that even given the will to adopt a single pronunciation, it would be difficult to achieve. There is no sure way of any two people saying the same word with precisely the same sound. In this respect pronunciation much more closely resembles handwriting than spelling. In spelling, there are absolute distinctions which can be learnt and imitated with complete precision: One can know at once whether a wont is spelt in a standard way or not. But two person' s handwritings and ciations may both be perfectly intelligible，yet have obvious differences without out being able to say which is“better”or more“standard”．
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Out of the seven pollutants mentioned in the first half of the article, hybrid cars produce fewer pollutants in at least five cases.
The nuclear energy is released at the Sun's center as high-energy gamma radiation, a form. of electro magnetic radiation like light as radio waves, only of every much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the x-ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth.
What does the passage mainly discuss？
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