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在VBA中，如果没有显示声明某个变量的数据类型，则此变量的默认数据类型为 ______。

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简述艺术家的修养和能力。

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The Case of the Disappearing Fingerprints One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing (51) become troublesome. A case released online in a letter by Annals of Oncology indicates how big a (52) of losing fingerprints is. Eng-Huat Tan, a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to (53) his nasopharyngeal cancer. After three years on the (54) , the patient decided to visit U.S. relatives last December. But he was stopped by U.S customs officials (55) 4 hours after entering the country when those officials couldn’t get fingerprints from the man. There were no distinctive swirly (56) appearing from his index finger. U.S. customs has been fingerprinting incoming foreign visitors for years, Tan says. Their index fingers are (57) and screened against digital files of the fingerprints of bad guys—terrorists and potential criminals that our federal guardians have been tasked with keeping out of the country. Unfortunately, for the Singapore travelers, one potential (58) effect of his drug treatment is a smoothing of the tissue on the finger pads. (59) , no fingerprints. "It is uncertain when fingerprint loss will (60) to take place in patients who are taking capecitabine," Tan points out. So he cautions any physicians who (61) the drug to provide their patients with a doctor’s note pointing out that their medicine may cause fingerprints to disappear. Eventually, the Singapore traveler made it into the United States. I guess the name on his passport didn’t raise any red flags. But he’s also now got the explanatory doctor’s note-and won’t leave home (62) it. By the way, maybe the Food and Drug Administration, (63) approved use of the drug years ago, should consider (64) its list of side effects associated with this medicine. The current list does note that patients may experience vomiting, stomach pain and some other side effects. But no where (65) it mention the potential for loss of fingerprints.

A. prevent
B. preserve
C. presume
D. prescribe

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在对使用五大湖中的两个湖的十处沙滩的8000多人的调查研究中，多伦多大学的生态学家们发现游泳的人中呼吸疾病和胃肠疾病的患病率达69.6%，而没有游泳的人这两类病的患病率是29.5%。从上述数据能最恰当地得出如下哪个结论

A. 人们容易低估在这些湖中游泳的危险。
B. 在这两个湖中任意一个湖中游泳患上呼吸道和胃肠疾病的患病率比在其他湖中游泳的患病率高。
C. 除了呼吸道、胃肠疾病外的疾病不大可能与在这两个湖中的一个湖中游泳有关。
D. 在这些湖中游泳与呼吸道、胃肠疾病之间的联系为这二者之间的因果关系提供了证据。
E. 在这些湖中游泳的一大部分人对游泳可能引起的疾病有免疫力。

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当谈到工地的安全性时，美国远远排在像瑞典和加拿大等国的后面。在这三个国家中，监视工地安全情况的联合劳动管理委员会非常成功地减少了由职业引起的伤害。在美国，只有少数的几家公司有这样的委员会，并且是通过自愿的方式成立的。然而，在瑞典和几个加拿大的省内，联合安全委员会是法律要所要求的，且在所有中等和大型工地都有这样的委员会。下面哪一项被上面的论述所支持

A. 在美国，所有中等和大型工地创立联合安全委员会能导致由职业引起的伤害的减少。
B. 被法律要求的联合安全委员会在减少由职业引起的伤害上要比自愿成立的联合安全委员会有效得多。
C. 即使法律上要求在所有的中等和大型工地创立联合安全劳动委员会之前，瑞典和加拿大的工地安全性就比美国的高。
D. 在瑞典和加拿大，联合安全委员会在法律要求之前，就已在大多数的中等和大型工地上自愿成立了。
E. 如果美国要求在所有的中型和大型工地上都创立联合安全委员会，美国在工地的安全性方面将会超过瑞典和加拿大。

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