单项选择题 在临床上已证实，将受SARS病毒感染后治愈患者（甲）的血清，注射到另一SARS患者（乙）体内能够提高治疗效果。甲血清中具有治疗作用的物质是（）

单项选择题 由于投保人、被保险人未履行好保护保险标的安全的责任，致使保险标的危险程度增加的，被保险人按照合同约定应当及时通知保险人，保险人有权要求( )。Ⅰ．增加保费 Ⅱ．减少保费 Ⅲ．保费不变 Ⅳ．解除合同 Ⅴ．不得解除合同A．Ⅱ、ⅢB．Ⅰ、ⅣC．Ⅰ、Ⅱ、ⅤD．Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ

单项选择题 听力原文： A man was out hunting. He just happened to be hunting bears. As he made his way through the forest looking for the beasts, he came upon a large and steep hill. Thinking that perhaps there would be bear on the other side of the hill, he climbed up the steep cliff and, just as he was pulling himself up over the last high rock, a huge bear met him nose to nose. The bear roared fiercely. The man was so scared that he lost his balance and fell down the hill with the bear not far behind. As he tumbled down the hill, the man lost his gun. When he finally stopped at the bottom, he found that he had broken a leg. Escape was impossible and so the man, who had never been particularly religious (in fact this just happened to be a Sunday morning), prayed, 'God, if you will make this bear a Christian, I will be happy with whatever lot you give me for the rest of my life.' The bear was no more than three feet away from the man when it stopped dead in its tracks. The man looked up to the heaven, and then fell to his knees and prayed in a loud voice, 'Oh Lord, bless this food of which I am about to take.'(4)A．Tiger.B．Bear.C．Fox.D．Wolf.