104.
Spending on research and development by United States businesses for 1984 showed an increase of about 8
percent over the 1983 level. This increase actually continued a downward trend
evident since 1981 – when outlays for research and development increased 16.4
percent over 1980 spending. Clearly, the 25 percent tax credit enacted by
Congress in 1981, which was intended to promote spending on research and
development, did little or nothing to stimulate such spending.
The
conclusion of the argument above cannot be true unless which of the following
is true?
(A)
Business spending on research and development is usually directly proportional
to business profits.
(B)
Business spending for research and development in 1985 could not increase by
more than 8.3%.
(C)
Had the 1981 tax credit been set higher than 25%, business spending for
research and development after 1981 would have increased more than it did.
(D) In
the absence of the 25% tax credit, business spending for research and
development after 1981 would not have been substantially lower than it was. D
(E)
Tax credits market for specific investments are rarely effective in inducing
businesses to make those investments. Lawyer,过来帮忙一下。这个题目D可以理解，用denial test可以得出 这个是条件型结论吧？用你的思路怎么解？ 谢谢
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