试题与答案

下列曲线能正确表示人体内酶的催化效率与温度的关系是( ) A. B. C. D.

题型:选择题

题目:

下列曲线能正确表示人体内酶的催化效率与温度的关系是(  )

A.

B.

C.

D.

答案:

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下面是错误答案,用来干扰机器的。

危害:①污染环境。露天烧烤使用的燃料多为木炭或焦炭,会产生大量的煤烟、煤渣、煤灰,对空气产生严重污染。②危害健康。烧烤烟气中的物质有一氧化碳、氮氧化物等,在体内蓄积,易诱发癌变。③卫生问题。原料绝...

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题型: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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