It would be a shallow kind of optimism to assume that the introduction of the art of inventing has been as immediate and unmixed blessing to mankind.

It would be a shallow kind of optimism to assume that the introduction of the art of inventing has been as immediate and unmixed blessing to mankind.

A、It would be a shallow kind of optimism to believe that the introduction of the— art of inventing has directly benefited only mankind.

B、It would be a shallow kind of optimism to believe that the introduction — of the art of inventing has benefited mankind directly.

C、It would be a shallow kind of optimism to think that the introduction of the art of inventing has blessed mankind immediately and blessed only mankind.

D、It would be a shallow kind optimism to believe that the introduction of the art of inventing has benefited mankind directly and brought them only benefit.

正确答案：D