81.When demand for a factory's products is high, more money is spent at the factory for safety precautions and machinery maintenance than when demand is low. Thus the average number of on-the-job accidents per employee each month should be lower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance.
Which of the following, if true about a factory when demand for its products is high, casts the most serious doubt on the conclusion drawn above?
(A)Its employees ask for higher wages than they do at other times.
(B)Its management hires new workers but lacks the time to train them properly.
(0Its employees are less likely to lose their jobs than they are at other times.
(D)Its management sponsors a monthly safety award for each division in the factory.
(E)Its old machinery is replaced with modern, automated models.
这题选B,削弱的是average number of on-the-job accidents peremployee each month should be lower ,我懂了,可是我想选D,
我觉得它削弱了less money is available for safety precautions andmachinery maintenance.然后又因为这两部分是用and连接的,所以我认为既然B对,D就没理由不对,请教各位NN我究竟错在哪里呢?