有害。

　　3．His works __contain__(contain) many books， __including__(include) two long novels.

　　解析：考查动词用法。句意：他的作品含有很多部书，其中包括两部长篇小说。contain指全部；include强调部分。

　　4．As you know，we should pay special attention to __protecting__(protect) these young trees from being damaged.

　　解析：句意：你知道，我们应该特别注意保护这些小树苗免遭破坏。

　　5．(陕西高考改编)I'd appreciate __it__ if you could let me know in advance whether or not you will come.

　　解析：本题考查代词。句意：如果你能提前通知我你是否来我将不胜感激。在句中it充当形式宾语，真正意义上的宾语为if引导的从句。would appreciate it if..."要是......将不胜感激。"

　　6．In the past three months the area in the north of the country __has been affected__(affect) by the coldness.

　　解析：句意：在过去的三个月里，这个国家的北方地区遭遇寒冷的严重影响。be affected by 受到......的严重影响。

　　7．This was __so__ good a lesson that every student became interested in it.

　　解析：考查so...that...结构。句意：这节课非常好，每一个学生都感兴趣。so...that...如此......以至于......。so＋adj.＋a＋n.＝such＋a＋adj.＋n.。

　　8．When she was told her son's illness could be cured，she left the hospital __in__ relief.

　　解析：句意：当被告知她儿子的病能够被治愈时，她如释重负地离开了医院。in relief如释重负。

　　9．The organization has been working very hard to stop the endangered animals __(from)dying__(die) out.

　　解析：句意：这个组织一直致力于阻止濒危动物的灭绝。stop...(from) doing为固定搭配。

　　10．His coach never doubted that he could succeed in __setting__ (set) a new world record.

　　解析：句意：他的教练从来不怀疑他会成功创造新的世界纪录。succeed in doing sth.成功做某事。

11．The doctors insisted that the patient was __in__danger，and that he be operated on