第一节：阅读下列短文，从每题所给的四个选项（A, B, C和D）中，选出最佳选项，并在答题卡上将该项涂黑。（每小题2分，共30分）
In 1977 , a dead author of detective stories saved the life of a
nineteen-month-old baby in a most unusual way. The author was Agatha Christie, a gentle married lady and one of the most successful
writers of detective stories in the world.
In June 1977 , a baby girl became seriously ill in Qatar (卡塔尔) , near Sandi Arabia(沙特阿拉伯) . Doctors were unable to find out the cause of her illness, so she was flown to London and sent to Hammersmith Hospital. A team of doctors hurried to examine the baby only to discover that they, too, were puzzled by the very unusual signs of illness. While they were having a discussion about the baby’s illness, a nurse asked to speak to them.
Excuse me, said Nurse Marsha Maitland, but I think the baby is suffering from thallium poisoning(铊中毒) .