Which of the following best explains the word "sprawl" in paragraph 4？
A certain kind of large-canopied tree.
B. Stretching out one's body and limbs.
C. Urban high-rise building.
D. Growth or outward extension of a city.
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A．A foreign language.B．Good diction.C．Switchboard operation skills.D．None of the above
A foreign language.
B. Good diction.
C. Switchboard operation skills.
D. None of the above.
What is the main purpose of the passage？
A. To outline the research findings on the brain structure.
B. To explain the link between brain structure and gender differences.
C. To discuss the various factors that cause brain differences.
D. To suggest new areas in brain research.
A．$8 billion.B．$120 billion.C．$128 billion.D．$18 billion.
A. $8 billion.
B. $120 billion.
C. $128 billion.
D. $18 billion.
A．Tissue culture.B．Mapping.C．Solar energy.D．Weightlessness.
A. Tissue culture.
B. Mapping.
C. Solar energy.
D. Weightlessness.
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