33.a (A) Some examples (B) Those which (C) All that (D) Ones which 的 ( 2 ) Getting a Ph.D. is the highest academic achievement in the United States. In most cases, 34 professors with Ph.D.s are hired by universities. 35 , the Ph.D. is a research degree, not a teaching degree. This means that many of the professors in colleges and universities have been trained to do research 36 not to teach. 37 , research is considered much more prestigious than teaching, 38 is shown by the differences in salaries paid to researchers and teachers.

41.a _______________ The most common cause of depression is genetics. Some people are born with low levels of serotonin and dopamine and as a result, it is hard for them to experience happiness from typical happy events. Another cause of depression is alcohol or drug abuse. Misuse of drug will alter the brain’s normal chemical balance and result in short-term or longterm depression. Finally, contextual factors such as failed relationships, traumatic events, or an abusive childhood can also trigger depression. There are many factors that can cause depression, and it is an illness that cannot be taken lightly. (A) Depression is a serious illness that can be caused by many factors. (B) Depression is a serious illness and we have to take it seriously. (C) Some people have more chances to get depression than others. (D) There is a strong relationship between depression and drinking and drug abuse. 的

相關試題

相關試卷