A.relation
B.arrange
C.summary
D.eliminate

It is the writing English that causes difficulties to foreigners.
A.the writing
B.that
C.difficulties
D.foreigners

Mary found it hard to concentrate on her work because the noise.
A.hard
B.to concentrate
C.work
D.because the noise

Rice is most important plant in Vietnam.
A.Rice
B.is
C.most important
D.in Vietnam

After George had returned to his house, he was reading a book
A.had returned
B.his house
C.he
D.was reading

When the unemployment rate is high, the crime rate is usually also high.
A.The unemployment rate and the crime rate are both higher.
B.The higher the unemployment rate is, the higher the crime rate is.
C.The unemployment rate is as high as the crime rate.
D.The high rate of unemployment depends on the high rate of crime.

"You're always making terrible mistakes", said the teacher.
A.The teacher asked his students why they always made terrible mistakes..
B.The teacher realized that his students always made terrible mistakes.
C.The teacher complained about his student making terrible mistakes.
D.The teacher made his students not always make terrible mistakes.

According to the passage, studies of contemporary subsistence societies can provide a ________.
A.further understanding of prehistoric times
B.broader vision of prehistoric natural environments
C.further understanding of modern subsistence societies
D.deeper insight into the dry-land farming

A typical feature of both modern and prehistoric hunter-gatherers is that ________.
A.they live in the forests for all their life
B.they don’t have a healthy and balanced diet
C.they don’t have a strong sense of community
D.they often change their living places

According to the author, most contemporary and prehistoric hunter -gatherers share ________.
A.some methods of production
B.some patterns of behavior
C.some restricted daily rules
D.only the way of duty division