1)NoonehopesthathewillhisusefulnessA)retainB)keepC)prolongD)survive2)WavesofredlightareaboutwavesofbluelightA)twicelongerthanB)twiceaslongasC)twicelargethanD)twiceaslargeas如第二个,我觉得A和B都是一样

Question

1)No one hopes that he will ___his usefulness
A)retain B)keep C)prolong D)survive
2)Waves of red light are about ___waves of blue light
A)twice longer than B)twice as long as C)twice large than D)twice as large as
如第二个,我觉得A和B都是一样的.
像第一个怎么翻译啊？第二个A为什么不对啊？

Answer 1

C
B