更多"Earth’s Inner Core
Scientists have"的相关试题:
[单项选择]Earth’s Inner Core
Scientists have long struggled to understand what lies at the planet’s center, Direct
observation of its center is impossible,so researchers must_____(51)to other evidence.
In 1889,a German scientist detected a severe earthquake in Japan.Geophysicists concluded that shock waves_____(52)jolts(晃动)from one side of Earth through the center to the other side.Then in 1936,Danish geophysicist Inge Lehmann studied the waves______(53) to determine that within Earth’s core of molten(熔化了的)iron lies a solid inner core-but_____ (54)that core was made of eluded(难倒)her.Other geophysicists quickly determined that Lehmann’s inner core was composed mostly_____(55)iron. Since then,Lehmann’s discovery has_____(56)conventional Earth science.
But now scientists are challenging traditional theory with new and radical _____(57) For example,Earth’s center could actually contain an“inner core within the inner core,claim Ishii and colleague Adam Dziewonski.Analyzing hundreds of thousan
A. create
B. receive
C. feel
D. overcome
[单项选择]
As long as we have been on earth, we have used
the sea around us. We take from the ocean and we give (41)
it. We take fish from the ocean — millions of
kilograms of fish, every year, to (42) millions of people. We
even use (43) bones for fertilizer and meal.
We take (44) from the ocean. One way to get salt
(45) sea water in a shallow basin and leave it (46)
it evaporates. Along with salt, other minerals are left after
evaporation — iodine (碘), magnesium(镁), and bromine(溴), to (47)
a few. Much gold and silver drift (48)
in the waters of the sea, too. But the sea does not (49)
them up by simple evaporation. Other gifts from the
sea are pearls, sponges(海绵), and seaweed. Pearls become jewelry. (50)
sponges become cleaning aids. Seaweed becomes (51) of many
kinds — A. ourselves B. ours C. our D. us
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