2. 外语
  3. ______scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to lo

______scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to lo

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问题 ______scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else.
选项 A、Even if
B、Until
C、Once
D、Since
答案A
解析 四个选项的意思分别是：even if即使；until直到；once一旦；since既然，自从。句意是，即使科学家开发出养育人类的新方法，地球上拥挤的状况也使得我们不得不在其他地方寻找空间。所以正确答案是A选项，如：I wouldn’t lose courage even if Ishould fail ten times．(即使要失败十次，我也绝不灰心。)
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