og-110

efficiency

110. Robot satellites relay important communications and identify weather patterns. Because the satellites can be repaired only in orbit, astronauts are needed to repair them. Without repairs, the satellites would eventually malfunction. Therefore, space flights carrying astronauts must continue. Which of the following, if true, would most seriously weaken the argument above? (B) Although satellites are indispensable in the identification of weather patterns, weather forecasters also make some use of computer projections to identify weather patters. (E) Technical obsolescence of robot satellites makes repairing them more costly and less practical than sending new, improved satellites into orbit. key:e,b为什么不行呢？有别的方法测天气，就不需要继续送人上天了，这不是weaken结论吗？请赐教，谢谢。