第9题: [单项选择]根据国内经验，胃溃疡行胃大部切除术时，应切除胃容积多少较合适（） A. 70% B. 60% C. 50% D. 40% E. 30% 参考答案:B 答案解析:对于胃溃疡，胃大部切除公认的切除范围是60%，既可以降低胃酸，又可以保证一定的胃容积。十二直肠溃疡的切除范围可以稍多些，一般认为是70%。故答案应选B。
第17题: [单项选择]The selection says that every animal is a living radiator because it ______. A. produces heat in its body cells B. burns fuel to produce heat C. gives off heat through its skin D. requires oxygen to produces heat 参考答案:C 答案解析:第一段第一句话解释了为什么every animal is a living radiator，是因为heat formed in its cells is given off through its
