C. Her son studies environmental protection in college.
D. Her son is protecting the environment.
Questions 3 to 3 are based on the following passage or dialog.
3.
A. To protect the environment.
B. To write a paper on the environment.
C. To do a good job for his classmate.
D. To make a mess of his classmate's work.
Questions 4 to 4 are based on the following passage or dialog.
4.
A. Both the man and woman think it should be adopted.
B. Neither the man nor the woman thinks it should be adopted.
C. Only the man thinks it should be adopted.
D. Only the woman thinks it should be adopted.
Questions 5 to 5 are based on the following passage or dialog.
5.
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