It is necessary to explain your theory _____, otherwise the????????????? audience won't make sense of what you are trying to get across.

A. on purpose????????????? B. at length????????????? C. at random????????? D.????????????? on average

单词填空，每空填一词（满分5分）。
76.  Keep indoors and don’t  ____________（暴露）your skin to the sun.
77.  They have put f_____________ a plan for reducing the level of traffic.
78.  Considering that he was always a careful person, we decided to __________(采纳) his idea at last.
79.  _______ （除了） from school work, I spend my spare time in singing and angling.
80.  Scientists foresee that bird flu and other epidemics will be w________ out with the development of science and technology.
81.  Most disaster experts believe that there is _____________ (潜在的可能性) that things could get a lot worse.
82.   Yesterday I rented a f_____________ apartment, so I didn’t have to buy any desks or chairs.
83.  Because the natural disasters occur at random times, it is difficult to warn people in a___________.
84.  However, learning English as a foreign language is very difficult in the a_________ of a native language environment.
85. More and more people think that nature __________ ( 值得 ) our protection because we ourselves depend on it to live our lives.

The librarian took a story book _____ from the shelf and gave it to the girl.

A．in vain            B．at random         C．at the moment      D．at any rate

(2013·高考湖北卷)An artist who was recently traveling on a ferry to the southern island discovered________a long lost antique Greek vase.

A．at random? B．by chance

C．in turn? D．on occasion

阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。注意：每个空格只填一个单词，并请将答案写在答题纸上。
In a memory – based competition between you and a chimp (猩猩); who do you think would win? If you put yourself on top, you might want to guess again.
In a test that challenged participants to remember numbers, a young chimp performed better than Japanese college students.
Here's how the test worked. At Kyoto University in Japan, human students and chimpanzee participants sat in front of a computer. Five numbers, ranging from 1 to 9, were combined with one another and then, they appeared at random places on the screen.
The numbers stayed on the screen for less than a second. In the first test, for example, participants saw the numbers for 650 milliseconds (about two- thirds of a second).
Then, each number disappeared and they saw a white square instead. Participants had to touch the squares in numerical order, based on the numbers that had been there a moment before.
In this test, the students touched the boxes in the correct order about 80 percent of the time. A young chimp named Ayumu performed equally well.
During a harder test, participants were only able to see the numbers for 210 milliseconds.
This time, students only succeeded in putting the boxes in the correct order about 40 percent of the time. But Ayumu still could select the boxes in the right order nearly 80 percent of the time.    
Some people have what's called a "photographic memory", which allows them to remember a surprising number of details after just a quick look at something. Ayumu's memory might work in a similar way, says lead researcher Tetsuro Matsuzawa.
The chimp's young age might have something to do with his impressive performance, too. In previous tests, the Japanese researchers found that young chimps performed better than their mothers.
The scientists are interested to see whether Ayumu loses his strong memory as he arrows older. They already know that young children sometimes have sharp memories when offered something photographical, but they lose this ability over time.