摘要：26．W.X.Y.Z四种短周期元素.原子序数依次增大.在周期表中W与X相邻.Y与z相邻.已知W元素的氢化物与Z元素的氢化物反应只生成一种盐a,X.Y位于同一族.它们能组成YX2.YX3两种常见化合物.请回答下列问题: (1)X元素位于周期表中第 族, (2)X.Y.Z三种元素形成的单质中.氧化性最弱的是 , (3)Y与Z可形成共价化合物Y2Z2.分子中Y与Z均满足8电子稳定结构.则Y2Z2的电子式为 . (4)a溶液的pH 7(填“> .“< 或“= ).用离子方程式解释为:若在a溶液中加入少量镁粉.可观察到的现象是: . (5)取pH＝0的W的最高价氧化物对应水化物的溶液100.0 mL于某容器中.加入0.90 g Cu.Ag合金样品.充分反应后测得生成WO气体的体积为156.8 mL.反应后容器中溶液的c(H+)=0.72 mol·L-1反应后溶液体积不变). 若设Cu.Ag的物质的量分别为x.y.欲求算x.y的值.可列出下列计算式: I．64x+108y=0.90 该计算式是依据 关系列出的, Ⅱ．2x+y＝1mol·L-1×0.1 L-(0.72 mol·L-1×0.1 L+0.1568 L／22.4 L·mol-1)该计算式依据的是 守恒.
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On an island there are exactly seven towns: T, U, V, W, X, Y and Z. All existing and planned roads on the island are two-way and run perfectly straight between one town and the next. All distances(距离；路程) by road are distances the main square of one town to the main square of another town. U is the same distance by road from T, V and W as Y is from X and Z. The following are of the now existing roads on the islands.
Road 1 goes from T to V via (经由) U.
Road 2 goes directly from U to W.
The triangle (三角形) road goes from X to Y, from Y on to Z, and from Z back to X. Any main square reached by two roads is an interchange (立交桥) between them, and there are no other interchanges between roads.
68. Which of the following sketches is correct?
A. W B. U 
T U V W V T
C. T U V W D. T W V
U
69. Draw a sketch of the Triangle Road. Which of the following sketches is correct?
A. Z B. Y X
Y
Z
X
C. X Z D. Y Z 
Y X
70. Which of the following is a town from exactly two other towns can be reached by road?
A. T B. X C. V D. W
On an island there are exactly seven towns: T, U, V, W, X, Y and Z. All existing and planned roads on the island are two-way and run perfectly straight between one town and the next. All distances(距离；路程) by road are distances the main square of one town to the main square of another town. U is the same distance by road from T, V and W as Y is from X and Z. The following are of the now existing roads on the islands.
Road 1 goes from T to V via (经由) U.
Road 2 goes directly from U to W.
The triangle (三角形) road goes from X to Y, from Y on to Z, and from Z back to X. Any main square reached by two roads is an interchange (立交桥) between them, and there are no other interchanges between roads.
68. Which of the following sketches is correct?
A. W B. U
T U V W V T
C. T U V W D. T W V
U
69. Draw a sketch of the Triangle Road. Which of the following sketches is correct?
A. Z B. Y X
Y
Z
X
C. X Z D. Y Z
Y X
70. Which of the following is a town from exactly two other towns can be reached by road?
A. T B. X C. V D. W
查看习题详情和答案>>Finding the Correct Place
On an island there are exactly seven towns:
T, U, V, W, X, Y and Z. All existing and planned roads on the island are two-way and run perfectly straight between one town and the next. All distances by road are distances the main square of one town to the main square of another town. U is the same distance by road from T, V and W as Y is from X and Z. The following are of the now existing roads on the islands.
Road I goes from T to V via (through... on the way) U.
Road 2 goes directly from U to W.
The triangle road goes from X to Y, from Y on to Z, and from Z back to X. Any main square reached by two roads is an interchange（立交桥）between them, and there are no other interchanges between roads.
(1) Which of the following sketches is correct?
[ ]
(2) Draw a sketch of the Triangle Road. Which of the following sketches is correct?
[ ]
(3) Which of the following is a town from which exactly two other towns can be reached by road?
[ ]
|
A．T. |
B．X. |
C．V. |
D．W. |
(4) It is possible that the distance by road from X to Y is not the same as the distance by road from
[ ]
|
A．T to U |
B．U to V |
|
C．U to W |
D．X to Z |
On an island there are exactly seven towns: T, U, V, W, X, Y and Z. All existing and planned roads on the island are two-way and run perfectly straight between one town and the next. All distances(距离；路程) by road are distances the main square of one town to the main square of another town. U is the same distance by road from T, V and W as Y is from X and Z. The following are of the now existing roads on the islands.
Road 1 goes from T to V via (经由) U.
Road 2 goes directly from U to W.
The triangle (三角形) road goes from X to Y, from Y on to Z, and from Z back to X. Any main square reached by two roads is an interchange (立交桥) between them, and there are no other interchanges between roads.
68. Which of the following sketches is correct?
A. W B. U
T U V W V T
C. T U V W D. T W V
U
69. Draw a sketch of the Triangle Road. Which of the following sketches is correct?
A. Z B. Y X
Y
Z
X
C. X Z D. Y Z
Y X
70. Which of the following is a town from exactly two other towns can be reached by road?
A. T B. X C. V D. W
查看习题详情和答案>>第二部分：英语知识运用（共两节，满分46分）
第一节 单项填空（共16小题；每小题1分，满分16分）
Nobody recognized her at the ball because she________________as a maid..
|
A．dress up |
B．was dressing |
C．was wearing |
D．was putting on |
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