四、将下列句子按时间发生的先后顺序排序。
A. I learned to eat with chopsticks when I was three.
B. I learned to speak at six months old.
C. I was born on April 5th, 2004.
D. I learned to swim when I was four, but I only went swimming in the bath.
E. I learned to climb when I was eight months old.
F. I learned to walk when I was one year old.
正确的顺序为：

C-B-E-F-A-D

五、英语小谜语。(可以用中文写出答案)

谜底：

cloud（云）