The writer cries partly because _____ .

• A、she is disappointed that they have to move to California

• B、she is afraid her son cannot find a job after graduation

• C、she misses the days when she could often see her son

• D、she feels sad that her son has achieved little at college

55.________.

What is the percentage of the teachers who think the students need hard work?

• A、64%.

• B、70%.

• C、75%.  

• D、87%.