题目内容
（请给出正确答案）
提问人：网友l******8
发布时间：2022年4月6日 07:28
[单项选择题]
Question 17 to 20 are based on the following passage. At the end of the passage, you will be given...Why sharks are useful for humans.*
A. Their tasty meat.
B. The principle of their defense system against disease.
G. Their solid skin.
D. The principle of their birth modes.
参考答案
十点题库官方参考答案
（由十点题库聘请的专业题库老师提供的解答）
