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11.As aquatic plants moved millions of years ago from the ocean to the land,they underwent a
+ w, W' c1 O4 e  \' P  number of adaptations.
3 w1 L5 y8 }3 v/ w6 v  A mishaps             B expansions        C setbacks         D modifications
12.One of California¬ðs greatest problems is providing adequate water to meet the needs of its
3 h& E9 [7 N, t% \) c   expanding population.
) N/ h" |. ]$ _   A sufficient           B palatable         C suitable          D unpolluted
13.Weed killers must be chosen and applied with great care to avoid damage to adjacent trees and
) n7 Z+ A( m5 U- {9 W+ P! D   shrubs.
, L  L9 [6 B- D* N3 Q   A indigenous         B nearby            C perennial         D similar
% u6 k* a6 h0 a/ q( f- w5 U: O14.Eleven states,including the adjoining states of North and South Carolina,seceded from the
   United States in the 1860¬ðs and formed a southern confederacy.
   A separated          B neighboring        C colonial          D competing
15.I admire his work.
   A recognize          B exploit            C tolerate          D esteem
11.D12.A13.B14.B15.D