An earthship is a special kind of house ①that is environmentally (A)friendly.
1. 위 글에서 (A)friendly의 쓰임으로 가장 적절한 것을 아래의 사전 뜻풀이에서 고르시오.4번
① kind, behaving as a friend.: My late uncle was especially kindly to me.
② being a colleague, helper, partner, etc. rather than an enemy.: America is a friendly nation to us.
③ denoting things that are made easy or convenient for those for whom they are intended: user friendly
④ indicating that something causes little harm to something: eco-friendly
⑤ on close or affectionate terms with: I put a lot of friendly terms on that particular letter.

1. subjcet각각의 뜻풀이 부탁드려요
① Cockroaches are good experimental subjects.
② We are subject to the laws of nature.
③ History is my favorite subject.
④ The prisoner was subjected to cruel punishment.
⑤ They discussed the subject of environment.

각각의 뜻풀이 궁금합니다. 알려주세요 ^^