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问题 多项选择题

血吸虫毛蚴与水中原生动物的要点是（）.

A.前者透明发亮，有折光，后者灰黄或灰白色，不透明，无折光

B前者游动迅速，来回不停，匀速前进，后者游动缓慢，时游时停，游速不匀

C.前者呈间歇式、波浪式、螺旋式、跳板式和摇摆式游动，后者碰壁后折回，一般不在中途改变方向，折回后又直线匀速前进

D.前者为直线前进，后者多为曲线前进，无一定方向

E.前者在水中容易识别，后者不容易识别

答案

参考答案：A, B

单项选择题

呼吸困难依据病因可分下列几种，但除外

A．肺源性呼吸困难
B．心源性呼吸困难
C．中毒性呼吸困难
D．血源性呼吸困难
E．吸气性呼吸困难
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填空题

Today, we’ll talk about what other effects watching TV might produce on children. Children should be (1) a lot of television, many experts and parents agree, but there is at least one circumstance when it might be beneficial: (2) . A recent study conducted by Italian researchers found that children (3) immediately preceding and during blood tests experienced less pain than children whose mothers (4) during the procedure, or children whose mothers were present but (5) .
The research, led by Carlo Brown, MD, at the University of Siena, is published in the Archives of Disease in Childhood. (6) the study. None received any type of anesthesia; the children and their mothers (7) . Both the group whose mothers attempted to distract them from the blood tests and those whose mothers simply observed reported (8) than the group who watched cartoons. For that group, the levels of pain were less and the children were better able to (9) .
One of the possible explanations is that children might have (10) during the procedures, exacerbating their perception of pain. "The higher pain level reported by children during (11) shows the difficulty mothers have in interacting positively (12) in their children’s life," the authors write.
However, they stressed that (13) still provided benefits, noting that the children would (14) during the procedures. "Indeed, children state that having their parent present (15) when in pain," say the authors.
Another possibility offered for consideration is the notion that the (16) might release pain-quelling endorphins. Endorphins, (17) produced by the pituitary gland, resemble opiates in their ability to produce analgesia and a sense of well-being. In other words, they might (18) .
In any case, the study results suggest that health workers should (19) to watch television during painful procedures (20) .
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