已知X＋、Y2＋、Z－、W2－四种离子均具有相同的电子层结构。下列关于X、Y、Z、W四种元素的描述，正确的是 ( )
A．原子半径：X＞Y＞Z＞W
B．原子序数：Y＞X＞Z＞W
C．原子最外层电子数：Y＞X＞Z＞W
D．金属性：X<Y，还原性：W2－＞Z－
答案：B
题目分析：A原子半径：X＞Y＞W＞Z，错误。B.原子序数：Y＞X＞Z＞W，正确。C.原子最外层电子数：Z＞W＞Y＞X ，错误 。 D.金属性：X＞Y，还原性：W2－＞Z－，错误。
| 先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案，并将其标号填入题前括号内。 | ||||
| Many people thought that 23-year-old table tennis player Zhang Yining had no chance at the 2004 Athens Olympics. But she went on to win the singles (单打) gold, 1 them all. Zhang didn't play very well in the early matches in the Athens Olympics. The young woman from Beijing was lucky because the rivals (对手) in these doubles and singles matches were 2 a big problem. Wang Nan was Zhang's partner. People said she was playing calmly and skillfully. Zhang, 3 , was suffering from being nervous and not playing well. She had been waiting for the Olympic Games all her life. But when she got to Athens she found she wanted to 4 so badly that she was stressed out. Zhang didn't really improve in the next games. Her coach Li Sun was very 5 . He said that if she went on playing like this she was sure to lose at some point. It was just a matter of 6 . Li's words were a blow to Zhang. She started to think 7 she could play better. She realized that she was thinking too hard about winning. So she said to herself, "Forget the 8 . Just think about playing." It doesn't get easier. Zhang found herself the only Chinese player in the finals. She was her country's last hope for gold. Zhang knew it was really important for her to beat her 9 . Zhang won't forget August 22,2004. On that day she took the gold. "I knew I would win when I touched my rival's sweaty hand 10 the game started," said Zhang. "I could tell how stressed she was." | ||||
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