（Ⅱ）求直线PB与平面PCD所成角的大小；
3）根据材料三，概括新加坡是如何利用儒学进行道德教育的（4分）结合所学知识，指出新加坡推行道德教育的影响。（2分）
②以铝材为阳极，在H2SO4溶液中电解，铝材表面形成氧化膜，阳极电极反应式为______________。取少量废电解液，加入NaHCO3溶液后产生气泡和白色沉淀，产生沉淀的原因是__________________。
Some people are against killing wolves because ．
育种专家在稻田中发现一株十分罕见的“一秆双穗”植株，经鉴定该变异性状是由基因突变引起的。下列叙述正确的是
下列各句中，加点的成语使用不恰当的一项是
（3）分析图10中乙地的湿地形成原因，并指出湿地改善和保护生态环境的作用。（8分）
People tend to talk about presents in a fairly loving way. A woman whose mother had died years ago described the many gifts around her house.These were gifts that her mother had given her over the years:“I appreciate these, and they mean something to me,”the woman said,“because I remember the occasions they were given on, and that they were from my mother, and the relationship we’ve had.”The gifts remain and keep the relationship alive in mind. This woman felt the same way about the gifts she gave to others. She hoped that the recipients would look at here gifts in years to come and
A It was a village in India . The people were poor. However , they were not unhappy .After all, their forefathers had lived in the same way for centuries.
阅读下面的文言文，完成10-12题。
Elizabeth: Building houses with recycled materials and energy-efficiency systems
（9）到两互相垂直的异面直线的距离相等的点
What has the woman decided to do on Sunday afternoon
2010年上海世博会瑞士馆的许多设计展示了瑞士自然与人文地理特色，诠释了“城市，让生活更美好”的世博会主题。列举两例说明。
文章倒数第二段，作者对江南春天中“看不见”的春风另有一番描述。请结合文章内容，谈谈这样写好在哪里？（6分）