幼儿园的布局要求要保证幼儿的健康生活与成长，也便于家长的接送。

化简

（1）（$\sqrt{6}$﹣2$\sqrt{15}$）×$\sqrt{3}$﹣6$\sqrt{\frac{1}{2}}$

（2）（$\sqrt{2}$+$\sqrt{3}$）（$\sqrt{2}$﹣$\sqrt{3}$）+2$\sqrt{12}$．

某地3名小学生因探险失联。孩子们走在陌生的山路上，天渐渐黑了，他们越走越害怕，一直不停地大声哭喊，感觉越来越疲惫，离家也越来越远。这3名小学生表现出了（    ）

用嫁接的方法来培育新品种，嫁接的关键是（　　）

    The Winter Olympics are also called The White Olympics. At this time, many colorful stamps are published to mark the great Games. The first stamps marking the opening came out on January 25th,1932 in the United States for the 3rd White Olympics. From then on, publishing stamps during the White Olympics became a rule. During the 4th Winter Olympics, a group of stamps were published in Germany in November 1936. The five rings of Olympics were drawn on the front of sportswear. It was the first time that the rings appeared on the stamps of the White Olympics.

    In the 1950's, stamps of this kind became more colorful. When the White Olympics came, the host countries as well as the non-host(非主办方)countries published stamps to mark those Games. China also published four stamps in February 1980, when the Chinese sportsmen began to take part in the White Olympics.

    Japan is the only Asian country that has ever held the White Olympics. Altogether 14,500 million stamps were sold to raise money for this sports meeting.

    Different kinds of sports were drawn on these small stamps. People can enjoy the beauty of the wonderful movements of some sportsmen.