6. Christopher Columbus was the first person to navigate under the patronage of the Queen Isabella of Spain.
1 U# c) x" y* _2 U5 X [A] explore [B] sail [C] work [D] circumvent0 ^# d9 P) O: ]0 Q k
7. Immigrants entering the United States at the turn of the century often encountered living conditions radically different from those they had left behind.
* C) h( T: P9 ~/ U& n; k+ G3 u' C [A] apparently [B] drastically [C] admittedly [D] tragically
! [0 [5 K$ t. p 8. Steel expands in hot weather, so suspension bridges may sag a foot more on a hot day.8 z4 s2 g; k* d4 W8 n a* s
[A] shrink [B] droop [C] bounce [D] rise |0 k( q, Q- c/ }% M0 y' o
9. Many immigrants were prepared to work hard and in appalling conditions for the sake of their descendants.
* m1 X0 x, h/ s" h [A] benefit [B] health [C] property [D] entertainment+ I2 Q! c0 M3 X( o' G1 j* j
10. Ships passing on the high seas exchange salutes by lowering and raising their flags once.9 N* @9 Z3 p! ?) f w% j: ?
[A] information [B] ceremonies [C] greetings [D] privileges
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