硫酸阿托品鉴别反应为（） A．Vat1i反应 B．水解后FeC11的反应 C．硫酸盐

海滨岩石间的水洼中，常有如图所示的海葵，下列各项中不能表明海葵属于生物的是（　　）

A．海葵能吸收海水中的氧气

B．海葵将废物排到水中

C．海葵靠触手捕食海水中的小型浮游生物

D．海葵呈圆柱形，十分柔软

二尖瓣关闭不全时后叶损害杂音特点

A．单调高或粗糙

B．传至胸骨左缘和心底部

C．在呼气时增强

D．伴第一心音减弱

E．伴第二心音

How would you like to sleep with one half your brain asleep and the other half awake? Dolphins sleep this way. Recently, scientists at Indiana State University have discovered that ducks sleep this way too. They found that ducks sleep half awake so they can rest and watch for danger at the same time.

After putting their ducks in a row and videotaping them, some researchers found ducks on the end of each row spent more time asleep with one eye open, apparently looking for predators.

“The more the ducks felt threatened, the more they slept with one eye open,” said lead author Niels C. Rattenborg, a graduate student at Indiana State University, Terre Haute. “The unique aspect is not that they do it, but that they control it. When they sleep at the edge of a group, they tend to realize greater danger, so they spend more time sleeping with one half of their brain.” Ducks with one eye open were still awake enough to detect predators, said the authors of the study, which appears today in the journal Nature.

The researchers studied four groups of four ducks held in plastic boxes, which were arranged in a row. Ducks on the end were found to sleep with one eye open 31.8 per cent of the time, compared to 12.4 percent of the time for ducks in the central position.

Also, ducks in the central position did not open one eye more than the others, while ducks on each end kept the eye facing away from the group open 86.2 per cent of the time. Brain wave readings of the ducks showed that the half of the brain receiving signals from the closed eye indicated that half of the brain was sleeping. Signals from the half of the brain receiving signals from the open eye showed a state between fully awake and asleep.

小题1:The under lined word “predator” is most likely to mean      .

A．an animal that is likely to be friends with ducks

B．a human being who looks after and feeds ducks

C．a scientist who does research work on animals

D．an animal that hunts, kills and eats other animals小题2:Ducks at the end of each row sleep with one eye open because      .

A．they are looking for food

B．they are watching out for danger

C．they want to enjoy the scenery

D．they are unique in their sleeping habit小题3:Which of the following is true according to the passage?

A．Ducks with one eye open at the edge can still enjoy a certain degree of sleep.

B．Ducks with less sense of duty usually choose to stay in the center of a row.

C．Ducks on the northern end of a row would keep their eye facing the south open.

D．A video tape recorder was the only electronic device used in the experiment.

背腰部刮痧的部位不包括（）循行的皮肤。

A、督脉

B、任脉

C、左侧足太阳膀胱脉

D、右侧膀胱脉

铸坯表面横裂发生在振痕的波谷处。