2.Located in Washington,D.C.,the Library of Congress contains an imposing array of books on every conceivable subject.
(A) history n. 历史，历史学；历史记录；来历
(B) collection n. 采集，聚集；[税收] 征收；收藏品；募捐
(C) catalog  n. [图情][计] 目录；登记

3.Invented by Walter Hunt in the 1800's,the safety pin gained great popularity because of its many applications.
(A) instruments n. 仪器（instrument的复数）
(B) habits n. 习惯（habit的复数）；[生物] 习性
(C) uses n. 使用；用途；发挥

4.The authors of the United States Constitution attempted to establish an effective national government while preserving autonomy for the states and liberty for

individuals.
(A) independence n. 独立性，自立性；自主
(B) prosperity n. 繁荣，成功
(C) dignity n. 尊严；高贵

5.Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
(A)determined v. 决定；断定（determine的过去分词
(B) argued vt. 辩论，争论；证明；说服
(C) pretended v. 假装（pretend的过去式和过去分词）；装扮

6.Tours are generally arranged by travel agents to satisfy the interests of those who are most likely to take such trips.
(A) planned adj. 有计划的；根据计划的;v. 打算（plan的过去分词）；设计
(B) explained v. 解释（explain的过去式及过去分词）
(C) studied v. 学习（study的过去式）

7.The Morrill Act of 1862 authorized the states to use federal lands for the extablishment of colleges that would offer programs in agriculture and the mechanical

arts.
(A) challenged vt. 向…挑战
(B) persuaded v. 说服，劝说（persuade的过去分词形式）
(C) empowered v. 允许；授与权力（empower的过去式）

答案：CBCA AAC

详解：

1.applauds
vt. 赞同；称赞；向…喝采
The audience laughed and applauded.
观众欢笑并且鼓掌。

2.array
n. 数组，阵列；排列，列阵；大批，一系列；衣服
As the deadline approached she experienced a bewildering array of emotions.
随着最后期限的临近，她心绪变得纷繁复杂起来。

3.applications
n. 应用；应用程序；应用软件（application的复数）
The service works as a software application that is accessed via the internet.
该业务是一个可以通过因特网访问的软件应用程序。

4.autonomy
n. 自治，自治权
Activists stepped up their demands for local autonomy last month.
活动的积极分子上个月提高了其对地方自治的要求。

5.ascertained
v. 确定（ascertain的过去式）；查明
Through doing this, the teacher will be able to ascertain the extent to which the child understands what he is reading.
通过这样做，老师将能确定这个孩子对他正在读的内容的理解程度。

6.arranged
v. 安排；计划；准备（arrange的过去式和过去分词）
They arranged for a concert on the weekend.
他们为周末的音乐会做准备。

7.authorized
v. 授权；批准；辩护（authorize的过去分词）
It would certainly be within his power to authorize a police raid like that.
他肯定有权批准那种警方突袭行动。