单元：UNIT 07.txt

• square
• meter
• deep
• desert
• population
• Asia
• tour
• wall
• amazing
• ancient
• protect
• wide
• achieve
• achievement
• southwestern
• thick
• include
• freezing
• condition
• take in
• succeed
• challenge
• in the face of
• force
• nature
• even though
• ocean
• weigh
• birth
• at birth
• up to
• adult
• bamboo
• endangered
• research
• keeper
• awake
• excitement
• walk into
• fall over
• illness
• remaining
• artwork
• wild
• government
• whale
• protection
• huge
• dynasty
• base