7.______ is known to the world, Mark Twain is a great American writer.
A.That
B.Which
C.As
D.It [解析]本题是语法结构题，考点是as引导的定语从句。这句话的意思是：众所周知，马克.吐温是一位伟大的美国作家。As 引导的定语从句经常和such , same 等词连用，或经常用在as is known to us, as is expected , as might be expected , as is often the case 等句型中
8.Evidence came up ______ specific speech sounds are recognized by babies as young as 6 months old. A.what
B.which
C.that
D.whose
[解析]本题是语法结构题，考点是that引导的同位语从句，先行词是evidence。这句话的意思是： 有证据表明，出生仅6个月的婴儿就能辨别一定的语音。同位语从句与先行词是等同关系，先行词多为表示事实、看法、思想、消息等的名词。常见的有：fact, idea, belief, thought, hope, evidence, doubt, news等。
9.The robots used in nuclear power plants can prevent human personnel from being ______ to radiation.
A.released
B.disclosed
C.revealed
D.exposed
[解析]本题是词汇辨析题，考点是expose….to使…暴露于…;使….接触….;本题的意思是：在核工厂使用的机器人可以使人不接触辐射。prevent…. from doing sth. 阻止某人不…..; release释放; disclose 泄露，揭露; reveal 揭示
10.______, they began to get down to business.
A.The holidays are over
B.The holidays were over
C.The holidays being over
D.The holidays had been over
Ⅱ.Cloze Test
American business is based on the profit motive.So make no mistake. The company you work 11 will have some method of measuring employee productivity. Your future there will depend on 12 you rate.
Productivity is relatively easy to measure in some cases.13 a college student, your overall productivity was measured by your grade point average. Hourly workers, 14 assembly line operators,are usually measured by the 15 of items produced in a given amount of time. Measuring the productivity of some service and management personnel is 16 difficult because of the many factors to be considered.
New employees are 17 expected to perform at their maximum potential.A break - in period is allowed, 18 can be several weeks, depending on the job.By the time of your first performance evaluation, you should 19 average productivity. Then you should try to reach your 20.
11.A.for
B.out
C.to
D.on
答案：A
[解析]You work for是定语从句修饰The company, work for 的意思是为…工作。这句话的意思是：你为之工作的公司会有一些测量员工工作效率的方法。