病毒的致病作用包括（） A.病毒对宿主细胞的直接损伤 B.病毒引起宿主细胞转化 C.

3%的过氧化氢适用于（）

A.正常肉芽组织

B.肉芽水肿

C.厌氧菌感染伤口

D.大量坏死组织创面

E.化脓创面

记账以后，发现记账凭证应借、应贷的账户名称错误，应采用的更正方法是 ( )。

A．划线更正法
B．红字更正法
C．补充登记法
D．平行登记法

绘制单井采气曲线文字说明：凡有重大情况应用文字说明，如：各种测试，换压力表，改变工作制度，作业，各种事故和异常产出情况等。

按决策条件的可控程度划分，可分为确定型决策，风险决策和（）。

A.不确定型决策

B.程序化决策

C.非程序化决策

D.常规决策

Dina Borzekowski made a study of a group of third-grade students from six American schools. During a school year, nearly 400 students and their parents were asked to report on whether they had such things as televisions and computers in the home, as well as how often the child used them. The children’s language ability was tested (测验) twice over the year. Children who had a television set in the bedroom but did not have a computer at home scored (得分) the lowest, while students without TV in the bedroom but with a computer at home scored the highest. Students who had a television in the bedroom over the school year scored lower than those who had their TV taken away during the same time.
"This study suggests that taking TV sets out of children’s bedrooms, or not putting them there, may be helpful," said Borzekowski. "While this study does not prove (证明) that bedroom TV was the reason for the lower test scores, it suggests that children shouldn’t have TV in their bedrooms. It also suggests that a home computer may help a child’s test scores. The best way was having both: no TV in the bedroom and also a home computer to use. \

Who took part in the study
[A] Teachers and parents.
[B] Students and their teachers.
[C] Students and their parents.