单选题
Read the following text and decide which answer best fits each space. For questions 26-45, mark one letter A, B, C or D on your Answer Sheet. Museum Science When deadly virus outbreaks occur, scientists want to know where the disease is coming from and how to stop it. In their search for【C1】______. some will pay a visit to their local museum. They are not trying to take their minds off the outbreak.【C2】______. they come to sift through the museum's historic collections, looking for【C3】______that might help them save lives. For instance, in the 1990s, there was an【C4】______of hantavirus in New Mexico and nearby states. The sometimes-deadly disease【C5】______flulike symptoms and difficulty breathing. At the time, no one knew the【C6】______of the outbreak. Some people even suspected terrorists might have【C7】______the germs as a biological weapon. But Robert Baker and his coworkers wondered if a rodent might be to【C8】______This biologist is a director at the Natural Science Research Laboratory at the Museum of Texas Tech University in Lubbock. Baker knew mice and rats can【C9】______viruses to humans. So he turned to the lab's stores of dried and frozen tissues for help. Those【C10】______included some collected decades earlier from New Mexico rodents. His team analyzed deer-mouse lung samples that had been【C11】______in a freezer since the 1980s. Some indeed【C12】______hantavirus. This showed the germ existed in New Mexico long38 the state's human outbreak developed. The finding suggested biological weaponry was not outbreak's source. Most【C14】______, it pointed to how people could limit infection with the 【C15】______virus: Keep deer-mice out of their garages and homes. Robert Bradley now works【C16】______the museum's curator of mammals. He says the episode taught him an important【C17】______Collections like the one he manages let scientists travel back in 【C18】______to answer important questions. "One hundred years from now,【C19】______knows the questions that will be asked?" But, he notes, if samples from the past are【C20】______. they can help future scientists answer their questions.