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.
a这句话是对的，可是我看不懂橙色的部分是什么意思 In 1980, a Danish ten-øre coin minted in 1747 was sold at auction for $8,000. Eleanor Bixby owns another Danish ten-øre coin minted in 1747. When she puts it on the market next week, it will fetch a price over $18,000. Which of the following, if true, would most weaken the conclusion drawn above? (A) Since 1980, the average price for rare coins has increased by over 150 percent. (B) There are only four coins like the one in question in the entire world. (C) Since 1980, the consumer price index has risen by over 150 percent. (D) In 1986, a previously unknown cache of one hundred coins just like the one in question was found.（D） (E) Thirty prominent, wealthy coin collectors are expected to bid for Bixby’s coin. a为什么不对？ Determining the authenticity of purported pre-Columbian artifacts is never easy. Carbon-14 dating of these artifacts is often impossible due to contamination by radioactive palladium (which occurs naturally in the soils of Central and South America). However, historians and anthropologists have evolved two reliable criteria, which, utilized in combination, have proven effective for dating these artifacts. First, because authentic pre-Columbian artifacts characteristically occur in a coarse, granular matrix that is shifted by major earthquakes, they often exhibit the unique scratch patterns known as gridding. In addition, true pre-Columbian artifacts show a darkening in surface color that is caused by centuries of exposure to the minute amounts of magnesium in the soil of the Americas. The criteria above would be LEAST useful in judging the authenticity of which of the following? (A) An ax head of black obsidian, unearthed from a kitchen midden (B) A pottery bowl with a red ocher design, found in the ruins of a temple (C) A set of gold ear weights, ornamented with jasper pendants (D) A black feather cape from a king’s burial vault（D） (E) A multicolored woven sash found near the gravesite of a slave 这道题里说黑色是特征之一，为什么d是对的
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