18.Which of the following is WRONG?
(A) Recent studies have shown that high-level toxic gases are present inside the tombs of pharaohs.
(B) Scientists found that toxic gases could have poisoned those who entered the tomb.
(C) Lord Carnarvon, who had financed the digging, died of a mysterious disease.
(D) To achieve the goal, all the media needed to do was spreading a fitting rumor.