第二节：完型填空（共20小题；每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从36-55各题所给的四个选项（A、B、C、D）中，选出最佳选项。
The earliest men did not have much time for art; they faced many dangers, and hunting for food took 36 almost all their time . But after many thousands of years, 37 perhaps a million years or more, they became very good hunters, and 38 gave them a little free time which they could use for other things. A few of them began to paint on the walls of the caves 39 they lived. Many early artists painted animals 40 they were the most important things in their lives. Animals supplied 41 to keep them living, and skins to keep them 42 .
Like painters today, the 43 artists possibly painted for many 44 , Perhaps they wanted to give their cave a little brightness and color; perhaps they had a few special ideas which they could express most easily in a 45 and perhaps they 46 wanted to spend a little time in a pleasant way. Many of them 47 magic（巫术），and they often drew animals which they caught. They 48 that by drawing these things, they would make them really 49 .
In many parts of the world , people have 50 cave paintings. The earliest paintings 51 we know about are in Europe. Because of the 52 weather, the earliest men in Europe used the caves for 53 ; in many warmer parts of the world, this was not necessary. We know a lot about the 54 of the Eurpopean paintings, and we believe that the earliest 55 were painted about thirty thousand years ago.
36．A．away B．back C．out D．up
37．A．even B．though C．and D．or
38．A．which B．this C．what D．who
39．A．which B．that C．where D．when
40．A．although B．because C．if D．as if
41．A．air B．fur C．food D．water
42．A．comfortable B．warm C．beautiful D．healthy
43．A．super B．early C．clever D．talented
44．A．people B．places C．animals D．reasons
45．A．painting B．word C．smile D．wall
46．A．often B．quite C．just D．even
47．A．believed in B．took advantage of C．tried out D．begged for
48．A．knew B．hoped C．understood D．realized
49．A．disappear B．appear C．miss D．find
50．A．searched B．looked for C．discovered D．known
51．A．which B．that C．when D．as
52．A．sunny B．warm C．cool D．cold
53．A．home B．house C．shelter D．building
54．A．names B．dates C．places D．shows
55．A．that B．one C．it D．ones