某植物体细胞内只有一套染色体（一个染色体组），含单套基因，所以它是一倍体（ ）
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普通小麦染色体是2n=42，二粒小麦2n=28，一粒小麦2n=14，所以一粒小麦就是单倍体。（ ）
A. 对
B. 错
Another title for this reading could be _____
A. Water for the Rich. Not for the Poor
B. a. Why We Waste Water: Two Points of View
C. Water Shortages and Problem Solver
D. Politics and Water: Fighting for a Drink
Which of these statements about Castile-la Mancha is NOT true?
A. Its situation is common to many places around the world
B. Overfishing has caused a great deal of environmental damage
C. Illegal well digging is a significant problem.
D. The Los Ojos area has been dry for over 30 years.
How many people worldwide don't have proper toilets or waterdisposal systems?
A. 1.2billion
B. 2.5 billion
C. 2.7 billion
D. more than 5 billion
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