Short conversation 3[音频]
A. The man is ungrateful in deciding to leave.
B. The man has a good reason to decide to leave.
C. She regrets having hone a lot for the man's career.
D. She asks the man to pay back the money spent on him.
Short conversation 4[音频]
A. He has to sit at the computer for half an hour.
B. He will stop to enjoy a coffee break.
C. He will finish his report soon.
D. He cannot afford to have a coffee break.
Short conversation 5[音频]
A. She was just telling a joke about quitting her job.
B. She wasn't satisfied with her salary.
C. She was fed up with counting money at her job.
D. She was to quit her job and look for an accounting job.
锥实螺旋向有左旋和右旋2种表型。一个左旋的锥实螺,自交后仅产生右旋后代,则这个左旋锥实螺的基因型为
A. Dd
B. DD
C. dd
D. 无法确定