20. We were going out for a walk ________ it began to rain.
A. while
B. before
C. as
D. when
二、完型填空
People have always communicated with __21___ . In the past when they couldn’t write ,they used simple symbols ( 记号) to send their message . Some groups of North America Indians were experts __22__ messages . For example , a small stone on top of a large one meant “ This is the way .” If there was another small stone on the right , it meant “Turn right .” Some grass with a knot ( 结)meant “ Danger ”__23__ .
Maybe you know that in the forests of Africa , it _24___ to travel from village . But drum ( 鼓 ) __25__ from many kilometers away . So , some groups of Africans made their drums __26____ like people .
The Incas ( 印加人 )of South America used to send messages by typing knots in a rope. Messages have been found , but __27___ can understand __28___ they mean . And the Egyptians used pictures as a kind of ___29__ but only _30____ people __31___ to understand them .
Today , we also use __32___ . When we are in a car and we see a red light , we stop the car . When a mother says to her child ,” Eat your cake!” the child eats the cake sometimes . The red light and the words of the mother are __33___ . And it is a ___34__ that the basic means of communication between people is , of course , sounds .
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