题目内容
According to this passage, one of the problems zoo keepers faced was ______.
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： I don't know what to do about my mother. She is always criticizing me...the way I dress, the way I speak or look...I can't even read a hook without her interrupting me to ask what it's about and tell me whether I should be reading it or not, and why. And of course every moment of my time away from her has to be accounted for...I try to tell her to stop interfering with my life, hut it doesn't seem to help. And I've no one to advise me, my father is dead and I have no brothers or sisters. It's not as if my mother has any worries; we're fairly well off and she doesn't have to work, only do the housekeeping. I've now met a wonderful girl who I want to see a lot of, but I'm afraid to bring her to the house when she meets my mother, she won't want to see me any more. I'm nineteen years old.
(27)
自动扶梯的坡度，通常为30%。 ()
边际成本替代率是指在等产量曲线上两种生产要素相互替代的比率。 ()
Libya has never gone in for weapons of mass destruction programmes, while Iran has done it.
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