大全-C-4

   Mainline Airways was bought by its employees six years ago. Three years ago, Mainline hired QualiCo Advertising Agency to handle its promotions and advertising division. Today Mainline’s profits are over 20 percent higher than they were five years ago and 10 percent higher than they were three years ago. Employee ownership and a good advertising agency have combined to make Mainline more profitable.

Which of the following best describes the weak point in the argument above?

(A) It fails to establish a causal connection between the change in ownership at Mainline Airways and the hiring of QualiCo, on the one hand, and the rise in Mainline’s profits, on the other.

(B) It presents no evidence showing that employee-owned airlines are any more profitable than other airlines.

(C) It assumes that the profits of Mainline Airways will continue to rise.

(D) It gives no exact figures for the current profits of Mainline Airways.

(E) It fails to explain how the profits of Mainline Airways are calculated.

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the conclusion of the argument is that Employee ownership and a good advertising agency have combined to make Mainline more profitable.

However, it fails to specify how the two factors are combined to raise the profits of the firm. Futhermore, the author doesn't provide any evidences about how the change of ownership influences the revenue.

So, A is correct anwser.

B is obviously wrong. The comparison between the profit of Mainline Airway and that of other firms is irrelvant to the argument at all.