1.The teacher asked that we should be____ in doing experiments.
A) earnest B) solemn C) grave D) concerned
答案：A earnest 一般用于人和人的态度，表示“严肃认真的”，含有真诚、热情的严肃对待的意味。
2.Although not an economist himself, Dr. Smith has long been a severe critic of the government.
A) economical B) economy C) economic D) economics
答案：C economy 经济;(某种) 经济;节约，节省。economics 经济学。economic 经济上的;有利可图的。economical (of )节约的，节省的。
3.They took ____measures to prevent poisonous gases from escaping.
A) fruitful B) beneficial C) valid D) effective
答案：D effective 可译为“有效的，生效的”，意指“能起作用的，能产生预期效果的”。valid 也可译为“有效的”，但意指“还可以使用的，仍为有关方面认可的”。beneficial 意为“有益的，有利的”。fruitful意为“多产的;寓有成效的”。
4.You should hire a more_____ manager than the one you currently have.
A) sufficient B) effective C) respective D) efficient
答案：D efficient 有效的，效率很高的。sufficient足够的。effective 有效的，效果好的，得力的;有生(力量)的，实际的。respective各自的。
5.She is a very _____secretary: she never forgets anything or makes a mistake.
A)anxious B) effective C) adequate D) efficient
答案：D efficient 有效的，效率很高的。anxious 亟于(做某事)的;焦虑不安的;令人焦虑的。effective
有效的，效果好的。adequate 足够的，充分的;恰当的。
6.The prime Minister frequently wandered from his text to ____on a point that had obviously caught his audience's interest.
A) elaborate B) interrupt C) stress D) explain
答案：A elaborate 详尽阐述。interrupt 打断。stress 强调，着重，为及物动词。explain 解释。
7.We____ our way through the mass of people.
A) gave B) thrust C) elbowed D)pushed
答案：C elbow one’s way。用手推。
8.The local government had a special meeting to____ the major.
A) select B) pick C) choose D) elect
答案：D 这四个词均有“选择，挑选”之义，但elect主要用于选举，指选某人当某一职务。而select侧重于精心、细致地比较、挑选，结果令人满意。pick 比较口语化，在日常生活中表示挑、摘、捡等动作。而choose 指经过多方比较之后做出选择。
9.The lady dressed in the latest Paris fashion is ____ in her appearance but rude in her speech.
A) elaborate B) excessive C)elegant D)exaggerated
答案：C elegant 娴雅的，有风度的。elaborate 详尽的。excessive 过大的，过分的，过量的。exaggerated 夸张的，夸大的。
10.It is rather____ that we still do not know how many species there are in the world today.
A) misleading B) embarrassing C) boring D) demanding
答案：B embarrassing 使人尴尬的。misleading 使人误解的。boring 使人厌烦的。demanding费事的，要求高的。
