11.
shoe
A. sole B. leather
C. laces D. walking
Answer & Explanation
Answer: Option A
Explanation:
All shoes have a sole of some sort.Not all shoes are made of leather (choice b); nor do they all have laces (choice c).Walking (choice d) is not essential to a shoe.
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12.
swimming
A. pool B. bathing suit
C. water D. life jacket
Answer & Explanation
Answer: Option C
Explanation:
Water is essential for swimming-without water, there is no swimming. The other choices are things that may or may not be present.
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13.
lightning
A. electricity B. thunder
C. brightness D. rain
Answer & Explanation
Answer: Option A
Explanation:
Lightning is produced from a discharge of electricity, so electricity is essential. Thunder and rain are not essential to the production of lightning (choices b and d). Brightness may be a byproduct of lightning, but it is not essential (choice c).