第18题: [单项选择]母乳喂养小儿患佝偻病较人工喂养小儿少的原因是因为母乳中() A. 钙/磷比例适宜 B. 含钙多 C. 含磷多 D. 含维生素D多 E. 含矿物质多 参考答案:A 答案解析:母乳中的钙/磷比例非常合适,为2:1,较牛奶中的钙更利于人体吸收。
第19题: [单项选择]David decided to take the express train because_________. A. he was in a hurry to get home. B. he did not enjoy flying at all. C. he needed time to be on his own. D. he had booked a seat on the train. 参考答案:C 答案解析:David decided to lake the overnight express train to Rome. Usually he would have gone by plane, but
第24题: [单项选择]A larg crowd assembled outside the American embassy.
A. watched B. shouted C. gathered D. walked 参考答案:C
第25题: [单项选择]以下对旅行社分社的叙述,不正确的是()。 A. 分社的经营范围不得超出设立社的经营范围 B. 设立分社的旅行社年接待旅游者要达到l0万人次以上 C. 进入全国旅行社百强排名 D. 国际旅行社每设立一个分社,需增交质量保证金50万元 参考答案:D 答案解析:国际旅行社每设立一个分社,需增交质量保证金30万元。