【单选题】人在安静状态下,心室每次射出血量为70毫升,人体内的血量大约为4000毫升,此人如果一分钟就可以使体内全部的血液循环一次,这个人的心率大约是 [ ]
【判断题】关于农产品中农药和兽药的残留超标问题,其中农药中毒对人体的危害更为严重。
【判断题】关于农产品中农药和兽药的残留超标问题,其中农药中毒对人体的危害更为严重。
【单选题】Tom graduated from college at a very young ago. Oh,he ___ have been a very smart boy then.
【单选题】—Tom graduated from college at a very young age. —Oh, he ______ have been a very smart boy then. [ ]
【判断题】关于农产品中的农药和兽药的残留超标问题,其中农残中毒对人体的危害更为严重。
【单选题】“ Tom graduated from college at a very young age. ”
【单选题】Tom graduated from Oxford University and has taught English here since then.