阅读下面材料，在空白处填入适当的内容（1个单词）或括号中单词的正确形式。

    Today so many people are talking about AIDS, for which, ____ (fortunate)，there is no cure now. When we talk about its influence on our society, this disease is ____ most severe public health problem of all that we are facing in the 21^st century. It is spreading at a(n) ____ (surprise) speed, especially in Africa.

    The UN AIDS organizations have come to the ____ (conclude) that in the past 20 years, 20 million people have died of AIDS. And this figure will be three times bigger in the next two decades ____ measures are taken in poor countries. Only if people change their basic behavior in time, can AIDS ____ (stop) from spreading. For example, in San Francisco, the rate fell greatly when a serious program was carried out. People were ____ (please) to change their behavior when they realized how serious a risk they were taking.

    Experts think in order to get the message across to those ____ don't realize the seriousness of AIDS, a well ____ (design) educational campaign is the only thing at the moment that can help. It would be criminal not to put it into practice. So everyone has a share of responsibility in the fight ____AIDS.

日本多火山地震的原因是日本处于（    ）

已知平面向量$\overrightarrow{a}$=（1，2），$\overrightarrow{b}$=（﹣3，x），若$\overrightarrow{a}$∥$\overrightarrow{b}$，则x等于（　　）

明代范潦《云间据目抄》记载：“（松江）嘉、隆以来，豪门贵室，导奢导淫，博带儒冠，长奸长傲，日有奇闻叠出，岁多新事百端……伦教荡然，纲常己矣。”对材料分析准确的是（    ）

学习了奥斯特实验后，小军和小民认为：通电的螺线管周围也存在磁场．可是，通电螺线管周围的磁场是什么样的呢？

为此，他们找来器材并连成了图甲所示的实验电路，运用研究磁场的方法来探究通电螺线管外部的磁场．