参考答案：
1．D 2．D 3．C 4．B 5．B 6．C 7．B 8．C 9．A 10．C
11．D 12．B 13．A 14．D 15．C 16．B 17．C 18．C 19．D 20．A
21．B 22．C 23．D 24．A 25．B 26．B 27．A 28．A 29．D 30．D
31．A 32．C 33．B 34．A 35．D
36．panel 37．symbolic 38．promote39．impressive 40．exchange
41．harmony42．misleading 43．altogether 44．descend
45．observatory 46．financial 47．glitter48．biology
49．postpone 50．strengthen51．accordingly 52．volunteer
53．temporary54．maintenance 55．accumulate56．was done 57．based
58．has turned 59．were estimated 60．hearing 61．more disturbing
62．taking 63．to bbe done64．Not having got 65．being convicted
66．Enterprises must be sensitive to the demand of the market．
67．If you do not study hard／work hard at your studied，you will stand no chance of winning / it will not be possible／it will be impossible for you to win in the contest．
68．It is not yet known／It is hard to say whether／if he will arrive／come on time.
69．People have different ideas／views about how to attain the goal．
70．The problem now is not what to read，but how to read．
71．除对食物的需求外，人类还有防暑、御寒、防风和防雨的需求。人类的第一个家园十分简陋，当时人们建造的房舍，无论从大小到种类，都受当时技术知识和建筑材料的限制，此外，气候也会产生重要影响。在某些地区，人类家园仅是山上的洞穴而已。洞穴入口处，燃起—堆火，既可照明、取暖，还可驱赶猛兽。在气候较为温暖的地区，原始人会用树枝搭建屋架，外面用树叶遮盖。
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