选出与所给单词同类的选项。

(B) ① kind  A．ruler  B．friendly    C．head

(A) ② quiet    A．clever  B．grass         C．tree

(C) ③ he      A．blue    B．yellow       C．they

(A) ④ tall     A．short    B．book        C．eraser

(B) ⑤ maths   A．pen     B．science      C．brother