听力音频：
Question 31-40
Comple the sentence below with NO MORE THAN TWO WORDS AND/OR A NUMBER.
Sear Urchins
Physical Features:
Feeds on 31. ______
Covered in 32. ______ that protect it.
Economic Value:
Once regarded to be a 33. ______
-
______ is a important market for exporting Urchins from California.
-
Scientists concerned ______ of urchin population due to overhunting.
Life cycle research:
No evidence of 36. ______
Maximum of life span: up to 37. ______ years old
After 22 years old, it grows 38. ______ cm per year.
It is still able to 39. ______ when it is old.
The growth sea urchin is unconnected to 40. ______ and other external factors.
答案
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