单项选择题

（）is the only vitamin our bodies can make for itself on condition that there is adequate sunlight.

A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D

<上一题目录下一题>

热门试题

单项选择题

A. It helps build snow.
B. It helps form clouds.
C. It helps construct storm.
D. It helps create sunshine.

单项选择题

A. China.
B. India.
C. Africa.
D. America.

（）is the only vitamin our bodies can make for itself on condition that there is adequate sunlight. 您的浏览器不支持 audio 元素。