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 the othe如右图表示pH、温度与反应物剩余量的关系，据图判断下列分析中正确的是 A．该酶的最适pH为8 B．温度从0→M变化过程中，酶的活性逐渐降低? C．pH从6升高到8，酶的最适温度不变? D．pH从6升高到8，酶的活性先升高后降低