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  3. Sputnik I was the first artificial satellite. It can be described as an alum

Sputnik I was the first artificial satellite. It can be described as an alum

游客2023-11-09  27
问题     Sputnik I was the first artificial satellite. It can be described as an aluminum(1)______ with a diameter of 58 centimeters and weighing 83.6 kilograms,(2)______ with instruments to measure the temperature and the (3)______ of the atmosphere. Sputnik I was launched into(4)______ around the Earth by the former Soviet Union on 4 October 1957. Since then, hundreds of artificial satellites have been launched,(5)______ with a different function.
    Some artificial satellites are used for telecommunication, which(6)______ us to make telephone calls to any part of the world, to see(7)______ television transmissions and to communicate via the Internet. Other artificial satellites are used for navigation,(8)______ people on Earth can know(9)______ any moment the position of an object, within a few meters.(10)______ are weather or meteorological satellites, launched to (11)______ the state of the atmosphere and to follow the(12)______ of the clouds as they gather. There are also military satellites, for the purpose of(13)______ information on the armaments and the troops in countries which may be(14)______ and also to indicate the launch of a missile.
    Each satellite has its own orbit which is(15)______ according to its purpose. Communications satellites, for example, have a geostationary orbit. That is an orbit which turns at the same speed as the(16)______ of the Earth. Satellites used for weather forecasting pass over the two poles of the Earth.(17)______ so doing, a different part of the Earth surface is viewed on each(18)______ orbit. All artificial satellites get the energy they need by huge solar panels which (19)______ like wings. These are (20)______ controlled in such a way that they are always turned toward the Sun. [br] (6)
选项 A、encourage
B、ensure
C、enforce
D、enable
答案 D
解析 词汇线索题。此处需填入的词应能构成一sb．to do sth．的结构，表示通讯卫星的作用是让我们在世界上任一地方都能打电话。故D项enable“使……能够”为答案。encourage“鼓励”和enforce“迫使”在用法上都符合，不过在意义上带有过多的感情色彩，不符合上下文语义；ensure“确保”常接双宾语或that宾语从句，用法不符。
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