—Excuse me, is this _______ bicycle?

—No, it isn't. _______ is over there under the tree.

读“地震波速度与地球内部构造图”，回答问题。

将4molA气体和2molB气体在2L的容器中混合并在一定条件下发生如下反应：
2A(g)＋B(g)  2C(g),若经2 s(秒)后测得C的浓度为0.6 mol·L^－1，现有下列几种说法：
①用物质A表示的反应的平均速率为0.3 mol·(L·s)^-1
②用物质B表示的反应的平均速率为0.6 mol·(L·s)^-1
③2 s时物质A的转化率为70％
④2 s时物质B的浓度为0.7 mol·L^－1  其中正确的是（  ）

如图A～D四种物质均含有同一种元素，A可以是单质也可以是气态氢化物，D是该元素最高价氧化物对应的水化物，则A,B,C,D中共同含有的元素可能是（   ）

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

      It is really sad news for Guinness World Records. Tiffany Two, the holder of the  ____(old) cat record, has passed away in hersleep at____ age of 27 years, 2months and 20 days.

        Born on March 13, 1988 in San Diego, California,Tiffany Two ____(buy) by herowner, Sharon Voorhees, from a local pet shop. At that time, the cat was onlysix  ____(week) old. Sharon named her TiffanyTwo in memory of the cat she once____(own) In the 1970s.

        In fact,____ Tiffany Two celebrated her 27^thbirthday back in March, she had lived the equivalent (等量) of 125 human years.

        Despite ____ unbelievable age, Tiffany Two was reported tohave good sight and hearing ____ (recent). Tiffany Two only had minor____ (ill) such as high blood pressure, and Sharondescribed her as “strong and still able to go up and down stairs”.

        “She's not afraid  ____ (play) with anyone or any animal.She walks right past the dogs. She's very active!” Sharon explained.