[单项选择]In the Mesozoic period, the upward thrust of great rock masses created the Rocky Mountains and the Alps.


A. collision
B. angle
C. push
D. erosion

[单项选择]In the Mesozoic period, the upward thrust of great rock masses created the Rocky Mountains and the Alps.
A. collision
B. angle
C. push
D. erosion

[单项选择]During your training period, it is of great importance to ______.


A. try to be a specialist
B. try to be a generalist
C. find an organization which fits you
D. decide whether you are fit to be a specialist or a generalist

[单项选择]According to the author, in a great period such as the Renaissance we may expect to find ______.


A. acceptance of truth
B. controversy over principles
C. inordinate enthusiasm
D. a dread of heterodox speculation

[单项选择]The concept of upward social mobility has been an abiding feature of American life.


A. enduring
B. unaffected
C. intriguing
D. observable

[单项选择]

The period of adolescence, i.e. , the period between childhood and adulthood, may be long or short, depending on social expectations and on society’s definition as to what constitutes maturity and adulthood. In primitive societies adolescence is frequently a relatively short period of time, while in industrial societies with patterns of prolonged education coupled with laws against child labor, the period of adolescence is much longer and may include most of the second decade of one’s life. Furthermore, the length of the adolescent period and the definition of adulthood status may change in a given society as social and economic conditions change. Examples of this type of change are the disappearance of the frontier in the latter part of the 19th century in the United States, and more universally, the industrialization of an agricultural society.
In modern society, ceremonies for adolescence have lost their formal recognition and symbolic significance and ther
A. graduations from schools and colleges
B. social recognition
C. socio-economic status
D. certain behavioral changes

[单项选择]The bird flew upward and dropped the shellfish onto the rock to ______it open.
A. cut
B. press
C. break
D. shake

[单项选择]Which period lasted longest


A. Paleolithic
B. Ice Age
C. Mesolithic
D. Neolithic