The photographs eokedstrong memories of our holiday inFranceA. refreshed B.stored
The photographs eokedstrong memories of our holiday inFrance
A. refreshed
B.stored
C.blocked
D.erased
The photographs eokedstrong memories of our holiday inFrance
A. refreshed
B.stored
C.blocked
D.erased
A、Much larger.
B、Much smaller.
C、The same size.
D、None of the above.
A.success
B.description
C.evidence
D.plan
A.can become an ongoing problem
B.may last as long as a week
C.are weight loss and mental disorder
D.are usually short-lived
A.people should create more natural environment areas
B.people would go on protecting national parks
C.certain areas of countryside should be preserved
D.people should defend the right to live in a peaceful environment
A.We have developed industry at the expense of countryside
B.We have forgotten what our original countryside looked like.
C.People living On islands should protect natural resources for their survival
D.We should destroy all the built up areas
?? What isthe coldest air temperature ever recorded on the Earth? Where was this lowtemperature recorded? The coldestrecorded temperature on Earth was -91'C , which _________(51) in Antarctica in 1983.??
?? Weencounter an interesting situation when we discuss temperatures in_________(52)tempera- tures in Earth orbit actually range from about 200C t0 1200C. Thetemperature depends upon ______________(53) you are in direct sunlight orshade. Obviously, -1200C is colder than our body can safely endure. Thank NASAscience for well-designed space ________ (54) that protect astronauts fromthese temper-ature ??????extremes. ???? ??
?? The space temperatures just discussed affectonly our areal of the solar________ (55). Obviously, it is hotter closer to theSun and colder as we travel away from the Sun Astronomers estimate temperaturesat Plu- to are about -2IOoC. How cold is the lowest estimated temperature inthe entire universe? Again, it depends upon your ___________ (56). We are taught it is supposedly_________ (57) to have a temperaturebelow absolute zer0, which is -273'C , at which atoms do not move. Two scientists, whose names are Cornell andWieman, have successfully cooled down a gas to a temperature barely________140-(58) absolute zero. They won a NobelPrize in Physics in 2001 for their work-nota discovery, in this case.??
?? Why isthe two scientists work so important to science?????
?? In the1920s, Satyendra Nath Bose was studying an interesting _ (59) about special light particles we nowcall photons. Bose had trouble _____________ (60) other scientists to believe histheory, _________(61) he contacted AlbertEinstein. Einstein's calculations helped him. theorize that atoms (62) behave as Bose thought-butonly at very cold temperatures.??
?? Scientists have also discovered that _(63) atoms can help them makethe world's atomic docks even more accurate. These clocks are so accurate todaythey would only lose one second _(64) six million years ! Such accuracy will. help us travel in spacebecause distance is velocity times time (d = vX t). With the long distancesinvolved in space ____________(65) , we need to know time as accurately aspossible to get accurate distance.??
A.opened
B.occurred
C.opposed
D.operated
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