6.  Christopher Columbus was the first person to navigate under the patronage of the Queen Isabella of Spain.

　　[A] explore            [B] sail              [C] work               [D] circumvent

　　7.  Immigrants entering the United States at the turn of the century often encountered living conditions radically different from those they had left behind.

　　[A] apparently          [B] drastically        [C] admittedly           [D] tragically

　　8.  Steel expands in hot weather, so suspension bridges may sag a foot more on a hot day.

　　[A] shrink              [B] droop           [C] bounce              [D] rise

　　9.  Many immigrants were prepared to work hard and in appalling conditions for the sake of their descendants.

　　[A] benefit             [B] health            [C] property            [D] entertainment

　　10.  Ships passing on the high seas exchange salutes by lowering and raising their flags once.

　　[A] information          [B] ceremonies       [C] greetings            [D] privileges

　　Keys:    6-10 BBBAC