A.The man should have called her relatives.B.She has visited San Francisco before
A. The man should have called her relatives.
B. She has visited San Francisco before.
C. She won"t need a tour guide.
D. She isn"t looking forward to her trip.
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An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Dorothy Crowfoot Hodgkin led a fruitful life and her success can be attributed to overcoming numerous hardships combined with her natural talents Answer Choices A. Unlike other children, she led a childhood which was full of opportunities to do chemistry experiments. B. Her studies at Oxford and Cambridge university laid a solid foundation for her great achievements later in life. C. After college, she carried on with more challenging research at Oxford university. D. In the 1950s and 1960s, she discovered the structures of penicillin and insulin, which were the greatest achievements in her life. E. In 1937, she received her doctorate and married Thomas Hodgkin. F. A past event with an old friend contributed to her future life in chemistry to some degree.
水霉无性生殖时产生两种游动孢子,开始产生的称为______,后来形成的称为______,这种现象称为______。