[单项选择]The difficulty lies（）their lack of money.
A. in
B. to
C. on
D. with

[单项选择]The difficulty lies ______ their lack of money.
A. in
B. to
C. on
D. with

[单项选择]The difficulty of lack of materials for researching on the 97% population was solved by
A. finding new historical recordings.
B. using their birth, marriage, and death records.
C. using the records of legal courts.
D. getting information from old people.

[单项选择]One difficulty in translation lies in obtaining a concept match, _____ this is meant that a concept in one language is lost or changed in meaning in translation.
A. By
B. In
C. For
D. With

[单项选择]The prisoners had difficulty communicating with each other because ______.
A. they were too sick to talk
B. they distrusted one another
C. no one felt like talking
D. they spoke different languages

[单项选择]The biggest difficulty facing historians might be their _______.


A. inability to offer convicting and correct explanations to each historical figure or event
B. lack of evidence for their interpretation
C. obsession with absolute accuracy
D. unwillingness to Doterpret history from different perspectives

[单项选择]The greatest difficulty cognitive scientists are now unable to solve is ______.


A. learning about how people solved problems
B. asking people to describe what they have in their minds
C. using computers to stimulate thought
D. recording mental processes of problem-solving

[单项选择]

Many people have difficulty in studying mathematics. Sometimes their difficulty (61) from the psychological idea that they are "no good (62) math". It has been demonstrated many times that it is often this idea (63) is causing their problems (64) than any lack of skill in mathematics. The (65) way to deal with this problem is to (66) yourself that math "involves using the same numbers you have been using (67) your life and that you know them as well as (68) else". Then set your mind to learning how they are used in the (69) part of mathematics you are studying.
Another problem many people (70) is that in mathematics, unlike some other (71) you may have studied, the material has a very important (72) or order. If you don’t understand a (73) of a mathematics text, it is no (74) going on to the next section. Many sections of math books are (75) o
A. founded
B. erected
C. based
D. constructed