Which of the following could best replace the word "band" in "We can think of it as a hidden band that contains the group'(in Paragraph 3)？
A. Strip of land.
B. Distance.
C. Society.
D. Community.
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What are the things experts might NOT advise youngsters to wear？
A. Wrist guards.
B. Elbow and knee pads.
C. Helmets of some kind.
D. Boots and thick clothes.
It seems that many of the recipients are not rich enough___________
"Truck-surfing" means
A. skating inside a truck while it is moving
B. skating while holding onto a moving truck
C. skating at a speed faster than a truck
D. skating at the end of a moving truck
Which of the following is NOT mentioned as one of the most common reasons for injuries？
A. Skating with wrist and elbow wounds.
B. Losing one's balance due to road debris.
C. Being unable to stop due to high speed.
D. Falling down when doing a trick.
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