Most stores open their doors for business very early on Black Friday.

• A、True
  
  

• B、False

• C、Not Given
  
  

六、完形補文：第 41~50 題，每題 1.5 分，共 15 分。

下面的短文有 10 處空白，每處空白后的括號內(nèi)有一個詞，請根據(jù)短文內(nèi)容將其正確的形式填入文中，以恢復(fù)文章原貌。

People Watchers

Some scientists do not wear laboratory coats (coat). And only _______(rare) do they use

microscopes. These scientists are ________(call) society scientists. They want to find out how people act and why they do _______ (certainty) things.

Some of them study the people of ______(differ) cultures to learn their ways of doing things.

They often live with the people of the culture they are________(study). They try to feel the world of these people. And they must be good reporters because facts, not opinions about other cultures, must be _________(report).

Another group of them studies how people_________(live) long ago. They dig in the ground to find old tools that have been_________(bury) for thousands of years. Sometimes, they even discover buildings hidden in the earth.

These scientists often work in cooperation with each other. If one of them_________(find) a Greek vase (花瓶）in the Middle East, he or she may ask for an_________(explain) from an expert to find out how the vase got there. 

 People like to shop online on Christmas Eve.

• A、True
  
  

• B、False
  
  

• C、Not given