2019年高考英語難點37講--難點26 斤斤計較的數(shù)字計算題
the traffic accidents last year caused a loss worth 27.32 million yuan, about 2.9 million us dollars.
economic daily also said 170 000 persons were injured in the traffic accidents in , fewer by 10 000 than in .
(from china daily, february 16, )
1.()in the total number of the traffic accidents was ________.
a.20 000 b.250 000 c.290 000 d.310 000
2.()in ________ persons were killed in the traffic accidents.
a.1 000 b.53 000 c.54 000 d.55 000
3.()which is true according to the news report?
a.the traffic accidents in will go up continuously.
b.economic daily said the traffic accidents caused a loss worth 2.9 million us dollars in .
c.in january , there were 3 821 highway traffic accidents.
d.there were more traffic accidents in january than in january .
b
microwaves that transmit television signals always travel in straight lines. because the earth is round, it is impossible to send live television over a long distance. for example, if we tried to send television signals directly from europe to america, the microwaves carrying the signals would shoot into space over the atlantic and would never reach america.
if we want to send television signals around the surface of the earth, we must send them from point to point by the relay system. on land we can set up relay stations(轉(zhuǎn)播站） for this purpose, and we can pass signals from station to station in a series of straight lines. however, we cannot do this so easily over water. in order to send pictures directly across the atlantic, for example, we would need to build a chain of relay stations across the ocean, which is about 3 000 miles wide. one choice would be to build one great tower in the middle of the ocean. but the tower would have to be 500 miles high!
both of these ideas are impossible. so we use the communication satellite thousands of miles in outer space to relay the television signals across the atlantic. a satellite receives the picture signals in a straight line from the ground station on one side of the atlantic, from england, for example. then it sends signals down again. also in a straight line, to the ground station on the other side of the atlantic in the united states. the communication satellite must be within the view of both ground stations at the same time.
4.()according to the passage, if we want to receive the tv programme all over the world freely, how many satellites shall we have at least?