一国两制的构想首先针对哪一问题提出、又首先在哪一问题上得到成功的运用

    While I was waiting to enter university, I saw an advertisement in a newspaper –a teaching job wanted at a school.  The school was about ten miles from where I lived. I was in great 1of money and wanted to do something useful, so I2.
    Three days later, a letter arrived.  It asked me to meet the principal of the school at Croydon. It proved to be a(n)3journey -a train to Croydon station, a ten-minute bus ride and then a walk of4a quarter of a mile.
    A man who was short and round seemed to be the principal and he opened the door for me. "The school," he said, "has a group of twenty-four boys between seven and thirteen years old." According to the man, I should have to teach all the subjects5art, which the man himself taught. I should have to6the class into three groups and teach them at three different levels, and I was not glad at the7of teaching Maths -a subject which I wasn't good at. It was8that I had to teach them on Saturday afternoon because most of my friends would be9themselves at that time.
    Before I had time to ask about my10,the man got up to his feet. "Now," he said,“You'd better meet my wife.  She is the one who really runs this school.”

某电池厂旁的河流淤泥中的蠕虫对镉有抵抗力．清除出河底大部分含镉的沉积物后，经过几代繁衍，研究人员发现蠕虫重新对镉变得脆弱敏感．下列说法正确的是（ ）