函数y=sin(x+10°)+cos(x+40°)(x∈R)的最大值是( )。
1
疟原虫感染者可产生的免疫是()。
A.先天性免疫
B.带虫免疫
C.终身免疫
D.消除免疫
E.足以防止每次感染的保护性免疫
Turning cultivated land back into forests or pasture is a fundamental way to stem soil ______ and desertification in the long run.
A.erosion
B.depletion
C.violation
D.delusion