. Many people think that it is ____________making such an experiment.
A．worthwhileB．worthC．worthyD．valuable
A
詞義辨析。Worthwhile (adj) 值得的worthwhile 用于下列句型It is worthwhile doing sth./ to do sth.  干某事是值得的worth  用于下列句型：sth. is worth sth/ doing此句型中只能用doing， 不能使用被動。 worthy 用于下列句型：sth. be worthy of sth/ being done     sth. be worthy to be done。故選A。
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