1As aquatic plants moved millions of years ago from the ocean to the land，they underwent a number of adaptations.
A mishaps
B expansions
C setbacks
D modifications
2One of California's greatest problems is providing adequate water to meet the needs of its expanding population.
A sufficient
B palatable C suitable
D unpolluted
3Weed killers must be chosen and applied with great care to avoid damage to adjacent trees and shrubs.
A indigenous
B nearby
C perennial
D similar
4Eleven states，including the adjoining states of North and South Carolina，seceded from the United States in the 1860's and formed a southern confederacy.
A separated
B neighboring
C colonial
D competing
5I admire his work.
A recognize
B exploit
C tolerate
D esteem
答案： 1D 2A 3B 4B 5 D