Many animals have an excellent sense of
smell, which they use in hunting. On the other hand, their eyesight may be poor.
Dogs, for example, have poor eyesight and no color vision. They see only shades
of gray. But the dog’s sense of smell is extraordinary, The kind of dog known as Alsatian has 220 million olfactory (嗅觉) cells. Man has five million. Scientists believe that the Alsatian is one million times better than man in finding out odors. The human sense of smell, however, is really quite good. The average human being can distinguish more than 10,000 diffe A. Many animals have poor eyesight while their sense of smell, is quite good. B. Dogs are color blind. C. The human sense of smell is not good. D. Dogs can see no more than shades of gray. [单项选择]According to the passage, an unusual feature of Mary was that she ()
A. was not much older than Phyllis B. wanted to become a teacher C. was comparatively well educated D. decided to take charge of Phyllis's education [单选题]下列哪一项不是早产的危险因素
A.食欲差 B.剧烈震动 C.孕晚期发热 D.精神打击 E.过度劳累 [单项选择]下列关于DNA生物合成的叙述不正确的是()。
A. 以四种dNMP为原料 B. 有RNA指导的DNA聚合酶参加 C. 为半保留复制 D. 有DNA指导的DNA聚合酶参加 E. 合成方式包括复制、修复和反转录 [单选题]( )操作必须办理操作票。
A.事故处理 B.拉合断路器的单一操作 C.全站停电 D.拉开单位仅有的一台接地隔离开关 [多选题]禁止使用制动装置( )的起重机械。
A.电控 B.失灵 C.内置 D.不灵敏 [填空题]必须始终保持机器图标和安全标志的()和()。一旦安全标志或象形图出现模糊或损坏,应立即()。
[单选题]双臂电桥测试电阻值的范围是( ).
A.0.001~11Ω B.0.0001~11Ω C.0.001~10Ω D.0.0001~10Ω [多项选择]有关特殊贸易方式进口货物的完税价格审定原则,下列表述中正确的是( )。
A. 内销的进料加工进口料件或其制成品,以料件申报内销时的价格估定 B. 加工贸易加工过程中产生的边角余料.以申报内销时的价格估定 C. 减税或免税的进口货物需予补税时,应当以海关审定的该货物原进口时的价格,扣除折旧部分价值作为完税 D. 以租金方式对外支付的租赁进口货物,在租赁期间,以海关审定的该货物的租金作为完税价格 [单项选择]素有“伤科圣药”之誉和“神药”、“仙丹”美称的中成药是()。
A. 乌鸡白凤丸 B. 大活络丹 C. 云南白药 D. 人参再造丸 [简答题]安全设施投资应当纳入建设项目决算。
[简答题]“千里通波慕琼花”,描写的是哪位君王?
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