_____________________is a quasi-periodic oscillation of the easterlies and westerlies in the tropical stratosphere with a mean period of 28 to 29 months.
A. ENSO
B. MJO
C. AMO
D. QBO
E. NAO
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The effects of global warming are being most keenly felt in the ______________ region, compared with the regions in other latitudes.
Arctic
B. mid-latitude
C. subtropical
D. tropical
The scientific evidence for the movie “The day after tomorrow” is based on___________________.
A. the rise of global sea level
B. the changes in the deep ocean circulation
C. the increase in ocean acidity
D. the increasing hurrican activities
The occurrence of sunspot varies in a/an ______________ cycle.
A. 9-year
B. 10-year
C. 11-year
D. annual
The standard period of “climate” is .
A. 3-7 days
B. one year
C. two years
D. 30 years