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问题 单项选择题 A1/A2型题

黄热病的传播媒介是（）

A.埃及伊蚊

B.三带喙库蚊

C.微小按蚊

D.大劣按蚊

E.嗜人按蚊

答案

参考答案：A

解析：黄热病是由黄热病病毒引起的急性传染病，病人常出现黄疸伴发热，故名。主要症状有发热、头痛、黄疸和出血等。埃及伊蚊是主要传播媒介。

单项选择题

有一种攻击是不断对网络服务系统进行干扰，改变其正常的作业流程，执行无关程序使系统响应减慢甚至瘫痪。这种攻击叫做 ______。

A．重放攻击

B．反射攻击

C．拒绝服务攻击

D．服务攻击
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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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