Question

訪客

求解釋 為什麼空格7是填when?

Fie could be made almost any 品ge __ 6. humankind move into 也ose areas 負ey
gfherWise could not have gone. Moreover, at a time _7. humans did not know about
baeterla,_ cooking meat helped prevent serious iinesses. _8. killing bacteria througnh
cooking, peopJe could eat wifhout falling 過. The use of fire and smoke also enabled people

2 exfra dried meat for ]ater. Lastly, fire 10. be an important form of protectior

 

sinee 並 coulld scare of unwanted guests or enemies. Believing it to be a sien of danger
some groups of people would avoid It.

Fire 1s 仙e most important djscovery in human history. We use it and see it every day

之生 信光39    是      才     和   和

高中英文

Answer 1

B

因為前面的at a time. 所以用when 來強調那個time