. Many people think that it is making such an experiment.A. worthwhileB. worthC. worthyD.

问题补充：

. Many people think that it is making such an experiment.

A. worthwhile

B. worth

C. worthy

D. valuable

答案：

(答案→)A. worthwhile

B. worth

C. worthy

D. valuable

解析：词义辨析。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， 不能使用被动。 worthy用于下列句型：sth. be worthy of sth/ being done sth. be worthy to be done。故选A。