What's the author's purpose of mentioning New York, Sydney and Tokyo？
A. To show that world economy will collapse with a big sea-level rise.
B. To indicate that many cities are usually built along the coastline.
C. To illustrate that most countries will suffer when sea levels rise.
D. To suggest that developed countries are free from see-level rise.
According to the passage, the sea-level rise is mainly caused by_____.
A. policies of short-sighted governments
B. overdevelopment of the human beings
C. greenhouse gas emissions
D. global climatic change
Why is third-hand smoke especially harmful to young children？
A. They are closer to where toxic chemicals remain.
B. Particles are more likely to cling to their hands.
C. Their immune system is not fully developed.
D. They haven't formed a good health habit yet.
What does "fly in the face of reality" (Line 2, Para.6) mean in the passage？
A. Cater for most people.
B. Go against reality.
C. Accord with the law of nature.
D. Accept the reality.
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