It’s to sign up for the cooking contest when you can’t cook a meal by yourself.A. reason

问题补充：

It’s to sign up for the cooking contest when you can’t cook a meal by yourself.

A. reasonable

B. conventional

C. positive

D. ridiculous

答案：

A. reasonable

B. conventional

C. positive

(答案→)D. ridiculous

解析：句意：你自己都不会做饭还报名参加烹饪大赛真是荒唐的。四个选项的含义分别是：A. reasonable 合理的，B. conventional传统的，习用的，平常的，C. positive积极的，D. ridiculous可笑的，荒谬的，荒唐的，所以选D。