某校今年招收新生420人,比去年增加70人,比去年增加______%.
70÷(420-70)
=70÷350
=0.2
=20%;
答:比去年增加20%;
故答案为:20.
Human facial expressions differ from those of animals in the degree __________ they can be controlled on purpose.
A.with which
B.to which
C.of which
D.for which
共同海损