A. Their tasty meat. B. The principle of their defense system against disease. C. Their solid skin. D. The principle of their birth modes. 参考答案:B 答案解析:[试题分析] 本题测试的是文章的细节部分。 [详细解答] “Medical researchers want to learn more about the shark's body defen
第15题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. The studio lost the roll of film. B. He ran out of money to pay for the film. C. The film hasn’t been developed yet. D. He didn’ t take pictures for lack of film. 参考答案:D 答案解析:[听力原文]
W: Did your pictures of the night view come out
M: Actually I ran out of film before I cou
第20题: [多项选择]下列各项中，可以用来评价企业偿债能力的指标有______。 A. 现金比率 B. 产权比率 C. 速动比率 D. 总资产利润率 E. 应收账款周转率 参考答案:A,B,C 答案解析:[解析] 现金比率、产权比率、速动比率可评价企业偿债能力，总资产利润率评价企业获利能力；而应收账款周转率评价企业的营运能力。
