单选题
Read the following text and decide which answer best fits each space. For questions 26-45, mark one letter A, B, CorD on the Answer Sheet We Really Can Tell if We Are Being Watched Stories about how people somehow know when they are being watched have been going around for years. However, few【C1】______have been made to investigate the phenomenon scientifically. Now, with the completion of the largest ever【C2】______of the so-called staring effect, there is impressive evidence that this is a recognisable and【C3】______sixth sense. The study【C4】______hundreds of children. For the experiments, they sat with their eyes【C5】______so they could not see, and with their【C6】______to other children, who were told to either stare at them or look away. Time and time again the【C7】______showed that the children who could not see were able to【C8】______when they were being stared at. In a【C9】______of more than 18,000 trials carried out worldwide, the children【C10】______sensed when they were being watched almost 70% of the time. The experiment was repeated with the【C11】______precaution of putting the children who were being watched outside the room,【C12】______from the starers by the windows. This was done just in case there was some【C13】______going on with the children telling each other whether they were looking or not. This【C14】______the possibility of sounds being【C15】______between the children. The results, though less【C16】______. were more or less the same. Dr Sheldrake, the biologist who【C17】______the study, believes that the results are【C18】______enough to find out through further experiments【C19】______how the staring effect might actually【C20】______.