The word those in paragraph 6 refers to
A. walls
B. roofs
C. huts
D. features
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According to the passage, children between the ages of five and seven typically experience
A. development of rational thinking
B. an interest in morality and rules
C. important changes in the brain
D. an increase in the physical growth rate
A group's collective intelligence may be enhanced significantly when it is joined by someone of______.
A. high intelligence
B. high prestige
C. high operating ability
D. high coordination ability
The privacy bill of rights is meant to______.
A. clamp down web surfers' dishonest behaviours
B. restrict internet firms' control over information
C. give American government control over information
D. ease the tension between digital marketers and web users
What became of Vinland after Thorfinn Karlsefni's party left？
A. Hostile native tribes destroyed the buildings．
B. It became a permanent colony a few years later．
C. Historians made no further mention of it．
D. It was sometimes used as a base for fishing．
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