赞题库-背景图
单项选择题

Can you imagine how you would feel if you fell dangerously ill and could not reach or call a doctor Millions of people 14 the world are in this unfortunate 15 , living in distant places 16 there are no railways, no proper roads and no telephones. Thousands of 17 are lost every year 18 could have been saved if medical attention 19 in time. 20 today help could be brought quickly and easily 21 many of these people 22 full advantage was taken 23 the aero-plane. 24 country has proved this 25 than Australia. The Australians 26 greater use of the aero-plane than any 27 people in the world. In no other country 28 the total number of miles flown by the 29 person so high. In fact, it has been 30 that Australians jump into planes 31 people in other countries jump into trains and buses.
It is not surprising, 32 that Australia should have been the first country 33 a Flying Doctor Service.

A.when
B.in which
C.which
D.they