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【单选题】用牛顿切线法解方程f（x）=0，选初始值x 0 满足（），则它的解数列{x n }n=0，1，2，…一定收敛到方程f（x）=0的根。
A.
f（x 0 ）f″（x）>0
B.
f（x 0 ）f′（x）>0
C.
f（x 0 ）f″（x）<0
D.
f（x 0 ）f′（x）<0
【单选题】Vice Vaccines At first glance, vice vaccines look just great. These injections promise to inactivate drugs such as cocaine, heroin and nicotine in the bloodstream before they reach the brain. Without ...
A.
the injection of drugs into the bloodstream
B.
the inactivation of drugs before they reach the brain
C.
the strong sensation aroused by taking drugs
D.
the addiction to drugs