A、
Electricity shortage.
B、
Food shortage.
C、
The heavy burden of studies.
D、
Overtime exposure to sunlight.
【正确答案】
C
【答案解析】
A、
1 hour.
B、
2 hours.
C、
3 hours.
D、
2.5 hours.
【正确答案】
C
【答案解析】
A、
Students in South East-Asia have great pressure in study.
B、
Genetic factors in visual impairment and blindness.
C、
Students in South East-Asia should spend more time outdoors.
D、
The reason why students in South East-Asia have pressure.
【正确答案】
C
【答案解析】
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