单项选择题

What did children need to do in the earliest time mentioned by the speaker

A．They needed to count and calculate money.
B．They needed to read and write.
C．They needed to alert moving objects.
D．They needed to hunt and farm.
<上一题 目录 下一题>
热门 试题

单项选择题
When did dendrochronology begin to interest archaeologists
A．It began 2000 years ago.
B．It began in the eighteenth century.
C．It began in the early twentieth century.
D．It began in this decade.
单项选择题
What causes differences in size and color of annual rings
A．The climate.
B．The exposure to light.
C．The length of time.
D．The fertility of the soil.
相关试题