题目

对下列四幅图的描述正确的是( )                                            A．图甲若表示有丝分裂，则b+c为一个细胞周期     B．图乙中温度在a、b两点时酶活性都很低，但在a点时酶的结构并未发生变化     C．图丙中bc段和de段的变化都会引起C3化合物含量的下降     D．图丁若表示有丝分裂过程，则造成cd段下降的原因是细胞一分为二听下面一段材料，回答第1-3题。1.What’s the relationship between the man and the woman? A.They are teacer and student.B.They are friends.C.They are mother and son.2. What does the woman ask the man to do?A. Look for a new apartment.B. Find a job to earn $ 200 a month.C. Share an apartment with one or two roommates.3. How much does the woman want to spend on rent?A. Less than $ 200 a month.B. Somewhere about $ 200 a month.C. A little more than $ 200 a month.