托福考试

【单选题】A social system is （） of social relations that draws the behavior of its members toward the core values of the group. 
A. a complex network 
B. how a complex network 
C. a complex network and 
D. a network that is complex 

【单选题】 For A sEAgoing, CArgo-CArrying sAiling vEssEls, thE ClippEr ship wAs rEmArkABly FAst.

【单选题】 Like triglycerides, cholesterol is a type of fat that is both consumed in the diet but manufactured by the body.

【单选题】 Lumber (production) was the (main industry) in Michigan until (the early) 1900's, (which) the automobile industry was established in Detroit.
A．production
B．main industry
C．the early
D．which

【单选题】 Norman Rockwell was a meticulous artist (who) paintings (portrayed) family incidents and well-defined (characters) with a wealth of supporting (details).
A．who
B．portrayed
C．characters
D．details

【单选题】 Elementary schools in the United states provide formal education __________ arithmetic, science, social science, and communication skills that including reading, writing, spelling, and speaking.
A．( such subjects as basic in
B．( as basic subjects in such
C．( in such basic subjects as
D．( as in such basic subjects

【单选题】 The Centennial Exposition, __________ in Philadelphia, Pennsylvania, in 1876, celebrated the one- hundredth anniversary of the Declaration of Independence.
A．was held
B．to be held
C．held
D．by holding

【单选题】 Air, which (it is) a mixture of elements oxygen and nitrogen (and compounds) water and carbon dioxide, also (contains) small quantities of (many other) substances.
A．it is
B．and compounds
C．contains
D．many other

【单选题】 Why does the author mention "aragonite" in line 26
A．To explain why fossils are rare
B．To compare aragonite fossils and calcite fossils
C．To argue that certain fossils are more informative than others
D．To illustrate the kinds of inorganic hard parts that can form fossils

【单选题】 The word "accumulated" in line 8 is closest in meaning to
A．( depended
B．( matured
C．( dissolved
D．( collected