28岁女子两次徒步进藏，步行一万五千多公里
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1 . According to the passage, what is the disadvantage of photosynthesis?
A.
It is easily influenced by weather.
B.
It makes plants produce much energy.
C.
It takes little time to function well.
D.
It makes plants absorb little energy available.
2 . What is the third paragraph mainly intended to show?
A.
How plants are influenced by sunlight.
B.
How a plant’s protective system works.
C.
How food is produced by plants using sunlight.
D.
How the protective system is similar to glasses.
3 . What can be inferred about the plant’s protective system from Paragraph 4?
A.
It works slowly but effectively.
B.
It is stable and unchangeable.
C.
It can be improved.
D.
It can be replaced.
4 . How can we produce more food according to the study?
A.
By exposing plants to much sunlight.
B.
By speeding up plants’ photosynthesis.
C.
By improving plants’ growing environment.
D.
By changing plants’ way of using sunlight.
