我校三年级（1）班一共有46人，参加语文兴趣小组的有30人，参加数学兴趣小组的有35人，那么既参加语文兴趣小组又参加数学兴趣小组的（　　）人．

    Hans Christian Andersen, a great Danish (丹麦的) writer, is very famous for his fairy tales (童话). He wrote a lot of best-known stories such as The Emperor's New Clothes and The UglyDuckling. His fairy tales have brought happiness to children across the world. The tales have versions (版本) of over a hundred languages.

    Andersen was born in Denmark in 1805. When he was still a young boy, he was already very clever and imaginative (富于想象力的). He created a small toy theatre and made clothes for his puppets (木偶). He also loved reading.

    In 1816, his father died and he learned to be a tailor (裁缝). Later he worked in a factory. At the age of fourteen, Andersen moved to the capital of Denmark to become an actor and gave performances (演出) in the Royal Danish Theatre. However, his voice changed when he grew older, so the job had to stop. Then he began to write poems and fairy tales.

    In the spring of 1872, Andersen fell out of bed and didn't get well again. He lived until 1875 and died peacefully at the home of his close friends.

马克思（1818-1883）说：“一个人口几乎占人类三分之一的大帝国，不顾时势，安于现状，……这样一个帝国注定要在一场殊死的决斗中被打垮。在这场决斗中，陈腐世界的代表总是激于道义，而最现代的社会的代表却是为了获得贱买贵卖的特权。”这里所述“最现代的社会的代表”是指（   ）       

标志着我国对外开放进入一个新阶段的是（    ）

请画出图中重物G所受重力的示意图和拉力F的力臂(用L把力臂表示出来)。