六、阅读短文,在空白处填入适当的单词或括号内单词的正确形式(有提示词的空格不限一词,无提示词的空格限一词)
A satellite is a moon (卫星), planet or machine that goes around a planet or star. For example, the Earth is a satellite 51
it goes around the Sun. Likewise, the Moon is a satellite because it goes around the Earth. The Earth and the Moon are examples of 52
(nature) satellites. Thousands of artificial (人造的) satellites go around the Earth.
Some of satellites are used 53
(take) pictures of the Earth to help meteorologists predict weather and track hurricanes (飓风). These pictures help scientists 54
(well) understand the solar system and the universe. And the information of the pictures 55
(help) people on the Earth work and live better.
There are also some satellites 56
(use) for communications. Before satellites, TV signals (信号) didn’t go very far because sometimes mountains or tall 57
(build) would block them. At that time, TV signals only travelled in straight lines. Phone calls to faraway places were also a problem. 58
(set) up telephone wires (电线) over long distances or underwater is difficult and costs a lot. 59
satellites, TV signals and phone calls are sent upward to a satellite. Then the satellite can 60
(send) the signals to different locations on the Earth.
With so many functions (功能), what’s the future of satellites? Do you know the answer?