【单选题】Jack is unfamiliar with an aesthetic knowledge. Once he wants to use N 2 O (laughing gas) to narcotize an experimental animal.Knowing that N 2 O has a low efficacy,he increases the concentration of th...
【简答题】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 What is the purpose of readig or studying? If you can't remember what you read or study,it will be a waste of time. 小题1: One useful aid that does help you rem...