Some people say love makes the world go around. Others say it is not love: it’s money. Since the truth is that it is energy that

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问题     Some people say love makes the world go around. Others say it is not
love: it’s money. Since the truth is that it is energy that makes the world go【S1】______
around. Energy is the currency of the ecological system and life becomes
possible even when food is converted into energy, which in turn is used to【S2】______
seek more food to grow, to reproduce and to survive. In this cycle all life【S3】______
depends. It is fairly well known that wild animals survive from year to year
by eating as many as they can during times of plenty, the summer and fall,【S4】______
storing the excess, usually in the form of fat, and then using these reserves
of fat to survive during the hard time in winter when food is scarce. But it is【S5】______
probably less well known that even with their stored fat, wild animals spend
less energy to live in winter than in summer. A good case in point is white-【S6】______
tailed deer. Like most wildlife, deer reproduce, grow and store fat in the
summer and fall when there is plenty of nutritious food available. A
physically mature female deer in the good condition who has conceived in【S7】
November and was given birth to two fawns during the end of May and first【S8】______
part of June, must search for food for the necessary energy not only to meet
her body’s needs but also to reproduce milk for her fawns. The best milk【S9】______
production occurs at the same time that new plant growth is available. This
is good timing, because milk production is an energy consuming process—it
requires a lot of food. The cost can be met unless the region has ample food【S10】______
resources.
【S1】

选项

答案Since--But

解析 篇章错误,衔接错误。the truth is that it is energy that makes the world go around与前面两个句子在意义和逻辑上是转折关系,而since只能引导原因状语从句或者时间状语从句。
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