要同学们培养绿豆以观察种子萌发的过程。有人问：“怎样才能让绿豆快点发芽？”小苹说：“可能要有水分及适当的光照和温度吧！”于是小明用绿豆进行四组实验，其处理方法及结果如下表所示（＋表示有，－表示没有）：

（1）小苹说：“可能要有水分及适当的光照和温度吧！”这句话属于科学探究的____ （填写科学探究的步骤）。
（2）甲、乙、丙、丁四组中，可以用来证明“光线是否会影响绿豆发芽”的是____ ，其中的变量是____ 。
（3）小明的实验证明了绿豆的萌发与____ 有关，与____  无关。

    The White House is an important historical building in the USA. It lies1the country's capital. Many people expect2see the palace with their own eyes.

    We3six months getting tickets to visit the White House. I was 4with excitement while we were waiting in the White House South Lawns. The first thing5interested me was the colorful flowers and green grass.

    Everything inside and outside was6kept in the white House. We went7many security checks(安检)8entering the building. In the east hallway9the first floor, I saw the pictures of past presidents on the walls. The10had over 2700 books. The Vermeil Room(金银屋) and China Room（瓷器屋） showed different11

    We walked upstairs to the State Floor. The East Room, the12in the White House, was the most wonderful in its size and furniture. This is the room where the president usually13the reporters. The Green, Blue and Red Rooms on the same floor got their names because of the 1414of the furniture and walls. These rooms are15having parties for state guests.

青藏高原上独特的地表景观是（  ）

有一首手语歌《感恩的心》，很美的音乐，很美的歌词，却只能用无声的语言来表达它深刻的内涵。《感恩的心》让我们一同感动中国！感恩父母给我们生命。每个人都享受着父爱、母爱。在家庭中，我们是子女；在学校，我们是学生；在商店里，我们是顾客；从法律上讲，我们又是国家公民……由此可以看出（    ）