[单项选择]Many scientists are so convinced of the benefits of challenging the brain that they are putting it into practice in their lives.
A. 许多科学家都确信，在他们的生活中，经常练习挑战大脑，就会带来效益。
B. 许多科学家都对勤于动脑的益处确信不移，他们在自己的生活中也努力实践着。
C. 许多科学家都如此确信挑战大脑会带来利益，他们的实际生活证实了这一点。
D. 许多科学家都相信，他们生命中所实践的就是对人的大脑挑战，这种挑战是有益的。

[单项选择]It is unusual for there ______ so many tourists on the beach at this time of the year.


A. be
B. were
C. being
D. to be

[单项选择]It can be inferred from the passage that many of our values ______.
A. are inborn
B. are learned
C. change as we grow up
D. can be selected

[单项选择]

The socio-economic benefits of education are many; most nations require mandatory schooling.（）

A. documentary
B. commentary
C. factory
D. obligatory

[单项选择]Many banks work with so many different customers and accounts that they need ______ to record all transactions.

[单项选择]So many people ______, the meeting had to be put off.


A. being absent
B. to be absent
C. were absent
D. had been absent

[单项选择]He had never given a speech for so many people, so he felt ______.
A. excited
B. stupid
C. disappointed
D. nervous

[单项选择]He had never given a speech to so many people, so he felt _____.
A. exciting
B. stupid
C. disappointed
D. nervous

[单项选择]Many political problems are so complicated that the layman cannot see the wood （）. the trees.
A. of
B. from
C. for
D. with

[单项选择]The ______ of schools, stores, hospitals, and so on is an important factor when purchasing a house.
A. publicity
B. proximity
C. purity
D. probability

[单项选择]Rarely （） by so many students.
A. so much time has been wasted
B. has so much time wasted
C. has so much time been wasted
D. has wasted so much time

[单项选择]Why did so many subjects give incorrect answers

[单项选择]

Human societies have experienced so many wars, but have you ever thought about what a war really is War may be a natural expression of biological instincts and drives toward aggression in the human species. Natural impulses of anger hostility and territoriality are expressed through acts of violence. These are all qualities that humans share with animals. Aggression is a kind of innate survival mechanism or an instinct for self-preservation that allows animals to defend themselves from threats to their existence. But on the other hand human violence shows evidence of being a learned behavior. In the case of human aggression violence cannot be simply reduced to an instinct. The many expressions of human violence are always conditioned by social conventions that give shape to aggressive behavior. In human societies violence has a social function. It is a strategy for creating or destroying forms of social order. Religions have taken a leading role in directing the powers of violenc
A. Legal systems greatly reduce the possibilities of physical violence.
B. Offenses against individuals are no longer judged on a personal basis.
C. Victims of violence find it more difficult to take revenge.
D. Punishment is not carried out directly by the individuals involved.