题目

For centuries, the body’s blood has been linked closely with the emotions. People who show no human emotions or feelings, are said to be cold-blooded killer. For example, the police are searching for a cold-blooded killer. He seems to kill for no reason, and no emotion, as if taking someone’s life as nothing. Cold can affect other parts of the body. The expression“get cold feet” has nothing to do with cold or your feet. The expression means being afraid to do something you have decided to do. For example, you agree to be president of an organization. But then you learn that all W、N、X、Y、Z是原子序数依次增大的短周期主族元素。Y所处的周期序数与族序数相等。甲、乙、丙、丁、戊是由这些元素组成的化合物，丁是氯碱工业的-种产物，戊为二元化合物，常温下0.01 mol·L— 1戊溶液的pH为2。上述物质的转化关系如图所示。下列说法中错误的是A.原子半径: N<Y<XB.W2N分子的比例模型为C.物质丁中含有离子键和共价键D.丙在固态时属于分子晶体