According to the speaker,what kind of communities do senior citizens prefer？
A. Communities near their family.
B. Communities in big cities.
Communities in warm climates.
D. Communities in the countryside.
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What kind of minerals can we find on the ocean floor？
A. Iron and copper.
B. Gold and copper.
C. Nickel and bronze.
D. Iron and bronze.
Why are senior citizens gaining more social influence？
A. The number of senior citizens is increasing rapidly.
B. The problem of senior citizen becomes more serious.
C. Senior citizens are less active than before.
D. More senior citizens are involved in politics.
What do the experts believe will happen by the year 2050？
A. The sea level will be 20 centimeters higher than it is now.
B. The sea will be empty if we continue fishing at this pace.
C. The problems to explore the sea will have been largely solved.
D. People will depend largely on sea foods and minerals.
Lippl talks about the way of losing weight by spending holidays on mountains with ______.
A. casualness
B. inaccuracy
C. uncertainty
D. confidence
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