What is the main idea of the passage？
A. Man has not fully utilized all his senses.
B. Man is not as good as animals in learning about the environment.
C. All senses have their limitations.
D. Insects are more sensitive to colors than man.
查看答案
If you intake enough vitamin A, you won't get lung cancer without giving up smoking.
A. Right
B. Wrong
C. Not mentioned
Vitamin B is essential for human body.
A. Right
B. Wrong
C. Not mentioned
Stomach cancer is the most dangerous among all cancers.
A. Right
B. Wrong
C. Not mentioned
There is an apparent link between lung cancer and vitamin A.
A. Right
B. Wrong
C. Not mentioned
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