例如在此篇文章的第一段中，有提到”explorer”(探險家)、”venture” (冒險)、”economic”(經濟的) 、” nationalistic”(國家主義的)，所以文章一定跟”探險家為了經濟和國家主義而冒險”有關。
For centuries, explorers have risked their lives venturing into the
unknown for reasons that were to varying degrees economic and
nationalistic. Christopher Columbus went west to look for better trade
routes to the Orient and to promote the greater glory of Spain. Lewis
and Clark journeyed into the American wilderness to find out what the
U.S. had acquired in the Louisiana Purchase, and the Apollo
astronauts rocketed to the moon in a dramatic flexing of
technological muscle during the cold war.
Although their missions blended commercial and
political-military imperatives, the explorers involved all accomplished
some significant science simply by going where no scientists had
gone before. The Lewis and Clark team brought back samples,
descriptions and drawings of the flora and fauna of the western U.S.,
much of it new to the colonizers and the culture they represented. The
Apollo program, too, eventually gushed good data. "Our
fundamental understanding of the overall geological history of the
moon is largely derived from the last three Apollo missions," says
Paul D. Spudis, a geologist and staff scientist at the Lunar and
Planetary Institute in Houston.
Today Mars looms as humanity's next great terra incognita. And
with dubious prospects for a short-term financial return, and amid a
growing emphasis on international cooperation in large space
ventures, it is clear that imperatives other than profits or nationalism
will have to compel human beings to leave their tracks on the planet's
( ) 1. The word imperatives in the second paragraph most likely means _____.
(A) commands (B) astronauts (C) reasons (D) voyages
( ) 2. What is the main idea of this passage?
(A) Mars will be the next place humans will explore.
(B) People explore for a mixture of economic and nationalistic reasons.
(C) Lewis and Clark brought back important information about the American west.
(D) Columbus wanted to get to the East by sailing west.
( ) 3. The author’s purpose in discussing the exploration of the moon and the American west is to _____.
(A) persuade the reader to pay tribute to famous explorers
(B) inform the reader about history
(C) hint at reasons for future missions to Mars
(D) narrate an interesting series of events