GRE作文是中国学生比较头痛的，经常准备很多时间最后还是只得到3.5。我之所以得到6分，个人认为我的文风比较淳朴扎实，有科学性，写的思路比较广(正、反、特)，字数也比较多(I800+、A700+)。
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mysterious than previously thought.
Issue 92
"It is a grave mistake to theorize before one has data."
Is it a "grave mistake" to theorize without data, as the speaker contends? I agree insofar as
to theorize before collecting sufficient data is to risk tainting the process of collecting and
interpreting further data. However, in a sense the speaker begs the question, by overlooking
the fact that every theory requires some data to begin with. Moreover, the claim unfairly
ignores equally grave consequences of waiting to theorize until we obtain too much data.
In one important respect I agree with the speaker's contention. A theory conjured up without
the benefit of data amounts to little more that the theorist's hopes and desires-- what he or she
wants to be true and not be true. Accordingly, this theorist will tend to seek out evidence that
supports the theory, and overlook or avoid evidence that refutes it. One telling historical
example involves theories about the center of the Universe. Understandably, we ego-driven
humans would prefer that the universe revolve around us. Early theories presumed so for this
reason, and subsequent observations that ran contrary to this ego-driven theory were ignored,
while the observers were scorned and even vilified.
By theorizing before collecting data the theorist also runs that risk of interpreting that data in
a manner which makes it appear to lend more credence to the theory than it actually does.
Consider the theory that the Earth is flat. Any person with a clear view of the horizon must
agree in all honesty that the evidence does not support the theory. Yet prior to Newtonian
physics the notion of a spherical Earth was so unsettling to people that they interpreted the
arc-shaped horizon as evidence of a convex, yet nevertheless "flattish," Earth.
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