Look at the ruler. It’s red. Look at the pencil. It’s green. Look at the eraser. It’s yellow. Look at the crayon. It’s blue. Look at the bag. It’s black. Look at the pen. It’s brown. Look at the pencil box. It’s white. Look at the book. It’s orange.

1.The ruler is ______.

A green

B yellow

C red

D black

解析：选C。C细节理解题。根据“Look at the ruler. It’s red.”可知尺子是红色的。故选C。

2.______ is yellow.

A The pencil

B The eraser

C The crayon

D The bag

解析：选B。B细节理解题。根据“Look at the eraser. It’s yellow.”可知，橡皮是黄色的。故选B。

3.The pen is _______

A white

B orange

C green

D brown

解析：选D。D细节理解题。根据“Look at the pen. It’s brown.”可知钢笔是棕色的。故选D。

4._______ is white.

A The pencil

B The pen

C The pencil box

D The book

解析：选C。C细节理解题。根据“Look at the pencil box. It’s white.”可知，铅笔盒是白色的。故选C。