题目内容
A．beer B．coffee C．milk D．tea
查看答案
搜索结果不匹配？点我反馈
更多问题
A. many B. satellite C. factory D. carry
What is (21) that a teacher most wants in his students？ Attentiveness？ A good memory？ Diligence？ Certainly these are the qualities commonly (22) with "good students" in the (23) mind. And certainly, too, these are the qualities that most (24) to teachers' comfort.
But the best students I ever had, (25) I remember the most wistfully, was a talkative, lazy day-dreamer. Sometimes he turned assignments in (26) , and a few he never (27) around to doing at all. Actually, my admiration for him was ironic, (28) I have never liked the name Ronald, (29) suggests to me the assumed name of a movie star. But he made one whole year of my (30) experience a delight.
21.
Passage Five
Roman soldiers in some places built long rows of signal towers. When they had a message to send, the soldiers shouted it from tower to tower. If there were enough towers and enough soldiers with loud voices, important news could be sent quickly over distance.
In Africa, people learned to send messages by beating on a series of large drums (鼓). Each drum was kept within hearing distance of the next one. The drum beats were sent out in a special way that all the drummers understood. Though the messages were simple, they could be sent at great speed for hundreds of miles.
In the eighteenth century, a French engineer found a new way to send short messages. In this way, a person held a flag in each hand and the arms were moved to various positions representing different letters of the alphabet (字母表). It was like spelling out words with flags and arms.
Over a long period of time, people sent messages by all these different ways. However, not until the telephone was invented in America in the nineteenth century could people send speech sounds over a great distance in just a few seconds.
51. According to this passage, the Roman way of communication depended very much on______.
A. supper B. suppose C. surround D. support
微信支付 
支付宝支付