更多"Unless astronomers ______ their sea"的相关试题:
[单项选择]Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of their time.
A. narrow down
B. boil down
C. tone down
D. let down
[单项选择]Astronomers at the University of California discovered one of the most distant ______
A. paradoxes
B. paradises
C. galaxies
D. shuttles
[单项选择]Why do astronomers often use photographic plates
A. To decrease the time it takes to photograph objects.
B. To avoid using a telescope.
C. To sharpen the color of what they observe.
D. To obtain images of distant objects.
[单项选择]An international team of astronomers has discovered 11 new planets outside the solar system, raising fresh ______ about the possibility of life in outer space.
A. exploring
B. debate
C. wondering
D. pondering
[单项选择]Astronomers have learned that the spectacular tails of comets are extremely tenuous bodies, ______ particles that the pressure of light can bend them.
A. comprising the least
B. composed of such minute
C. composed of very large
D. having so small number of
[单项选择]Astronomers are particularly interested in Eta Carinae because
A. it is in its final stage.
B. it is a supernova.
C. it exploded in 1987.
D. it is brighter than the Sun.
[单项选择]Astronomers believe that matter in different parts of the universe
A. obeys different laws.
B. obeys one common law.
C. obeys the same laws.
D. obeys no common law.
[单项选择]Solid geometry has enabled astronomers to calculate the positions of the heavenly bodies______ to one another.
A. absolute
B. relative
C. comparative
D. contrastive
[单项选择]For years, astronomers struggled to calculate the age of the universe.
A. 多年以来，宇航员们在努力计算宇宙存在的时间。
B. 多年以来，宇航员们在努力地探索，力求揭开宇宙的年龄之谜。
C. 多年以来，宇航员们在挣扎地探索，力求揭开宇宙的年龄之谜。
D. 多年以来，宇航员们在努力地计算宇宙的年龄现象。
[单项选择]Astronomers (have increases) their observation powers (greatly) through (improved) high-powered telescope, computer simulations and (coordinate) with other scientists.
A. have increases
B. greatly
C. improved
D. coordinate
[单项选择]Data from Voyager II have presented astronomers with a {{U}}puzzle{{/U}} about why our outermost planet exists.
A. problem
B. mystery
C. question
D. point
[单项选择]The leading astronomers of the sixteenth and seventeenth centuries were {{U}}fascinated{{/U}} by comets.
A. intrigued
B. infected
C. inconvenienced
D. inclined
