【单选题】 The student said to me, "She has made a close study of the problem." The student told me that she __ a close study of the problem. A. has make B. have made C. had make D. had made
【单选题】Please choose the only correct answer to the following question. The student said there were a few points in the essay he impossible to comprehend.
【单选题】人造水产品最早是由______研究和生产的。
【单选题】下列各项中,属于非系统性风险因素的是( )
【单选题】The student said there were a few points in the essay he impossible to comprehend.
【单选题】下列各种因素所引起的风险中,属于非系统性风险的是:
【多选题】良种繁育的生态条件主要包括下列()自然条件。,包括气候、土壤、生物群落等