单项选择题

For mankind, the sun is the source of （）

A．solar activity
B．all heat
C．all food
D．both B and C

<上一题 目录 下一题>
热门 试题

单项选择题
What is the main subject of the passage（）

A．Language acquisition in children.
B．Teaching languages to children.
C．How to memorize words.
D．Communicating with infants.
单项选择题
The underlined word feat is closest in meaning to which of the following（）

A．Experiment.
B．Idea.
C．Activity.
D．Accomplishment.
相关试题