1979年WH0将冠心病分为（） A.5型 B.6型 C.3型 D.2型 E.4型

Dogs are constantly learning from the reaction of human owners, picking up facial cues and anticipating their owner’s behavior, a new research suggests. The findings, published online in the journal Learning and Behavior, show that dogs essentially are always in training, and help explain how many owners unknowingly teach and reward their dog’s bad behavior.

Research conducted at the University of Florida focused on the role of eye contact and facial cues in influencing canine behavior. Earlier studies have suggested that dogs seem to know when they are being watched and even wait to perform forbidden behavior like digging in the garden when they know their owners aren’t looking. In this study, researchers studied how human cues triggered begging behavior among 35 pet dogs, 18 shelter dogs and 8 wolves raised in captivity. First the animals were taught that the human strangers helping with the experiment were reliable sources of tasty treats. The testers stood close together and called to the animal, and both offered rewards of Spam cubes or Beggin’ Strips treats.

After four rewards, the experiment began. Two testers stood against a fence or wall, about 20 feet apart and with food in their pockets. The dog was held about 20 feet away, equidistant from both testers. In one condition, one tester faced the dog while the other turned her back. In another, a tester held a book near her face, while the other tester held the book in front of her face, as if she were reading. In a third condition, one tester held a bucket near the shoulder, while the other put the bucket over her head, blocking her eyes.

Then, both testers called out to the dogs. All the animals—pet dogs, shelter dogs and wolves—ignored the person whose back was turned and sought food from the person who was looking at them. "The question was, are dogs and wolves responsive to a human’s attentional state" said Monique Udell, an assistant professor of psychology at Flagler College, Fla. But when the testers held books, it was only the domestic dogs who avoided the person who appeared to be reading the book. "In a house where they’re used to people reading books, they are sensitive to those types of cues," said Dr. Udell. Interestingly, in the bucket experiment, the animals, for the most part, were equally likely to seek food from the person with the bucket over her head as the person holding the bucket.

The experiment shows that dogs are tuned into whether humans are paying attention. "Dogs don’t have to read our minds. Dogs read our behavior," said Dr. Udell. Pet owners often get frustrated with bad dog behavior without realizing that they themselves have reinforced it, either by giving the dog a treat when they beg, skipping a bath when they protest or letting them sleep on the bed or couch.

The experiment shows that domestic animals（）

A. are more responsive to human attentional state

B. feel more intimate to their human masters

C. are not easily fooled by human behavior

D. demonstrate greater interest in facial cues

近年来相继发生“毒奶粉”、“毒豆芽”、“毒胶囊”、“皮革奶”、“牛肉膏”、“瘦肉精”、“地沟油”、“增白剂”、“彩色馒头”、“食品添加剂”等重大的食品安全事件．2011年12月24日国家质检总局抽查又发现蒙牛乳业（眉山）有限公司生产的一批次产品被检出黄曲霉毒素M1超标140%．黄曲霉毒素的危害性在于对人及动物肝脏组织有破坏作用，严重时，可导致肝癌甚至死亡．黄曲霉毒素M1为已知的致癌物，具有很强的致癌性．黄曲霉毒素M1的化学式为C₁₇H₁₂O₇，下列关于它们的叙述正确的是（　　）

A．黄曲霉毒素M1是氧化物

B．黄曲霉毒素M1中碳、氢、氧三种元素的质量比为17：12：7

C．黄曲霉毒素M1中氢元素的质量分数最小

D．黄曲霉毒素M1由17个碳原子、12个氢原子、7个氧原子构成

发生聚变的条件是___ ，我们往往采用___ 的方法来满足上述条件，这种反应又叫做___ 。 太阳每秒钟辐射出来的能量约为3.8 ×10²⁶J ，就是从           反应中产生的，太阳内部时刻进行着4个质子结合成一个氦核的反应，试写出核反应方程                                                      。

2017年10月31日，（）在以2∶0击败国安队之后，如愿获得本赛季中超冠军，并实现了中超联赛五连冠。

A.山东鲁能队

B.上海上港队

C.江苏舜天队

D.广州恒大队