下列房地产中，哪一项存在替代关系？（）
A.经济适用住房与高级别墅
B.住宅与其配套的商业房地产
C.宾馆与写字楼
D.大城市郊区的住宅与高速公路收费
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| 完形填空。阅读下面短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。 | ||||
| There are 12 star signs in total. Your star sign depends on your 1 . In western culture, some people believe that people 2 the same star sign share similar characteristics. There are lots of stories about star signs. 3 a story about Scorpio. Once upon a time, in Greece, there was a hunter 4 Orion who was the son of a sea god. He was handsome, brave and strong. One day he said he 5 kill all the dangerous animals. The mother of the land was quite 6 at what he said. She ordered a scorpion 7 him. The scorpion hid in the 8 and gave the hunter a sudden attack 9 the shoulder. The hunter tried his best to fight back. The fighting 10 for ten days and ten nights. In the end, they 11 died. From then on, 12 scorpions appeared, hunters would hide. They 13 met again. 14 your birthday is between Oct. 23rd and Nov. 21st, your star sign is Scorpion. You are a powerful person 15 energy. You can always keep secrets. However, sometimes you do not forgive others. | ||||
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药具入库时内包装验收项目是什么？
经专家估算，整个南海属我国传统海疆线的油气资源约合15000亿美元，开采前景甚至要超过英国的北海油田，用科学记数法表示15000亿美元是[ ]
A．1.5×104美元．
B．1.5×105美元．
C．1.5×1012美元．
D．1.5×1013美元．
锅炉停炉后的保养方法有（）和（）、（）和（）法
关于干细胞下列叙述不正确的是（）
A.胚胎干细胞可以治疗人类某些顽症
B.胚胎干细胞有细胞周期，神经干细胞分化形成的神经细胞没有细胞周期
C.造血干细胞分化形成白细胞的过程是不可逆的
D.如果通过转基因技术，成功改进了某血友病女性的造血干细胞，使其凝血功能全部恢复正常，当她与正常男性结婚，婚后所生子女的表现型都正常