3. If in a healthy state, coral reefs can .
A) stop tsunamis and storm events from attacking the coastlines
B) protect coastlines from the damage of extraordinary waves
C) stop people from fishing ear the coral reefs
D) protect coastlines from people s damage
4. What is said about humans activity as littering plastic bags and bottles?
A) It ca badly damage the coral reefs ear the coastline.
B) It can have impact on tourism of the developed countries.
C) It ca badly damage people s life near the coastline.
D) It ca pollute the ocean and influence tourism.
5. When mercury falls into the ocean, it was converted to a chemical of more harmful nature that can endanger .
A) unborn babies and young children
B) adult women
C) the environment of the ocean
D) the coral reefs
6. Carbonic acid has the most serious impact on .
A) the human being
B) shell fish and star fish
C) tunas and sharks
D) marine mammals
7. People bomb certain area of the sea and the killed fish floating on the sea surface
A) can be collected easily
B) can harm the ocean
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