更多"For three-quarters of its span on E"的相关试题:
[单项选择]For three quarters of its span on Earth, life evolved almost ______ as microorganisms.
A. precisely
B. instantly
C. initially
D. exclusively
[单项选择]In Earth's infancy, its surface was warm enough for life ____ the young Sun was fainter than it is today.
A. ( in spite of
B. ( whether
C. ( neither of which
D. ( even though
[单项选择]The sentence "our life span outpaces our usefulness" means we can live longer ______.
A. and make progress
B. and do more work
C. but move slowly
D. but become useless
[单项选择]Despite the fact that the life span of animals is conveniently divided into separate stages, including the prenatal, adolescent, and senescent, these periods are not truly______.
A. (A) co-dependent
B. (B) reflexive
C. (C) distinct
D. (D) coterminous
E. (E) continuous
[单项选择]Scientists believe that when life on earth began, the earth atmosphere consisted of ___________.
A. oxygen and nitrogen
B. hydrogen, oxygen and nitrogen
C. hydrogen and its compounds
D. hydrogen, oxygen and their compounds
[单项选择]Students learning about how life began on Earth may be presented with the perplexing question, "Which came first, the chicken or the egg"
A. pressing
B. puzzling
C. patronizing
D. penetrating
[单项选择]The history of life on earth has been a history of between living things and their surroundings.
A. interaction
B. intersection
C. interference
D. intercourse
[单项选择]Life as we know exists on the earth because the atmosphere _________.
A. contains a layer of ozone gases.
B. about 42 degrees colder than on the ground.
C. 21% oxygen by weight.
D. less than 1% of xenon by volume
E. about 75 degrees colder than in Interlaken
F. is warmed by the earth’s heat.
[单项选择]All life on the earth ______ on the sun.
A. depends
B. carries
C. keeps
D. goes
[单项选择]Whether there is life beyond the earth is ______.
A. the only question that excites people
B. one of several questions which excite people
C. one of the most exciting questions
D. the question which most excites people
[单项选择]All life on the earth ______ off the sun.
A. depends
B. carries
C. keeps
D. goes
[单项选择]The salmon spends its adult life in rivers and seas, but ______ .
A. its eggs are laid in streams
B. it lays its eggs in streams
C. in streams are laid its eggs
D. laid in streams are the eggs
[单项选择]Early forms of life on Earth, ______ in absence of oxygen, required other elements.
A. which lived
B. that lived
C. lived
D. were living
[单项选择]Without water, there ______ no life on the earth.
A. would be
B. be
C. is
D. was