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【单选题】
X、Y、Z、W四种短周期的最外层电子数之和为20．在周期表中X与Y、Z、W紧密相邻，X、Y两的原子序数之和等于Z的原子序数．下列说法正确的是（ ）A.
原子序数：Z＞Y＞X＞W
B.
X、Y、Z、W形成的单质最多有6种
C.
X元素最高价氧化物对应水化物的化学式为：H 3 XO 4
D.
四种元素的气态氢化物中，W的气态氢化物最稳定
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举一反三
【简答题】常见的储位编码方法有三种,分别为区段方式、品项群别方式、地址式方式。( )
【单选题】unit5
A.
She was just telling a joke about quitting her job.
B.
She wasn't satisfied with her salary.
C.
She was fed up with counting money at her job.
D.
She was to quit her job and look for an accounting job.
【简答题】“实”的病机是（ ）
【单选题】unit5
A.
She can't understand the man's point of view.
B.
The man should earn the bread.
C.
The man is responsible for his family.
D.
She can't agree more with the man.
【简答题】根据录音内容填空。 1. North points ____________ ____________ a map. 2. The U. K. is ____________. 3. This country is ____________. 4. The president of the U. S. ____________ in the White House.
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