American Salt Marshes · Part 4 · 第 31–34 题
Complete the sentences below. Write ONE WORD ONLY for each answer.
Complete the sentences below. Write ONE WORD ONLY for each answer.
American Salt Marshes
The salt content in marshes can be as high as that of the 31 .
At different times of the day, there are changes in salinity and in the 32 and warmth of the water.
Animals such as worms and shrimps feed on the 33 that grow in the marsh.
Marshland in the US has been used in the past for 34 cultivation.