题目

通过测交实验，能够推测被测个体的（    ） A．产生配子的种类                      B．各种配子的比例 C．基因型                              D．产生配子的数量 答案：ABC － Which hotel are you in? － I ________ in a hotel．A friend I met on the train ________ to put me up for a couple of nights． [　　] A．haven't stayed; has offered B．do not stay; offers C．am not staying; offered D．am not staying; is offering