“Excuse me,” said nurse Marsha Maitland, “__22__ I think the baby is __23_ from thallium poisoning.”

　　“__24__ makes you think that?” Dr. Brown asked. “Thallium poisoning is extremely _25__.”

　　“A few days ago, I was reading a novel called A Pale Horse __26__ Agatha Christie,” Nurse Maitland explained. “In the book, somebody uses thallium poison, and __27__ the symptoms are __28__. They are exactly the same as the baby’s.”

　　“You’re very observant and you may be right,” another doctor said. “We’ll _29__ some tests and find out __30__ it’s thallium or not.”

　　The __31__ showed that the baby had __32__ been poisoned by thallium, a rare metal used in making optical（光学的） glass. __33__ they knew the cause of illness, the doctors were able to give the correct treatment. The baby soon __34__ and was sent back to Qatar. Inquiries（调查） showed that the poison __35__ from an insecticide（杀虫剂）used in Qatar.

　　16. A. describe

　　B. diagnose

　　C. discover

　　D. discuss

　　17. A. flew

　　B. sent

　　C. went

　　D. was flown

　　18. A. inexpensive B. important

　　C. available

　　D. impossible

　　19. A. examine

　　B. see

　　C. look after

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