在小学英语学习中，掌握基本的颜色和形状是非常重要的基础部分。为了帮助三年级的学生更好地理解和记忆这些知识，我们特别准备了这份包含50道单选题的练习题。通过这些题目，孩子们可以在轻松愉快的氛围中巩固所学的内容。

1. What color is the sky?

A) Red B) Blue C) Yellow D) Green

2. Which shape has four equal sides?

A) Circle B) Triangle C) Square D) Rectangle

3. The apple is _______.

A) round B) square C) triangle D) rectangle

4. A banana is usually _______.

A) yellow B) blue C) green D) red

5. The book is _______ shaped.

A) circle B) triangle C) square D) rectangle

6. If you mix red and blue, what color do you get?

A) Purple B) Orange C) Pink D) Brown

7. A stop sign is _______ shaped.

A) circle B) triangle C) square D) octagon

8. The sun is usually _______.

A) yellow B) blue C) green D) red

9. A traffic light is often _______ colored.

A) red, yellow, green B) blue, white, black

C) purple, orange, pink D) brown, gray, silver

10. A star is usually _______ shaped.

A) circle B) triangle C) square D) star-shaped

这些问题涵盖了常见的颜色和形状，旨在帮助学生提高对英语词汇的理解和应用能力。希望每位小朋友都能通过这样的练习，更加自信地使用英语进行交流。如果有需要更多练习材料或有任何疑问，请随时联系我们。让我们一起努力，让学习变得简单又有趣！