—When did he finish the book?
一Last week.
A:read
B:to read
C:reading
D:reads
下列句中加横线词词义属于比喻义的一项是( )。
用如图所示装置进行实验探究,回形针与细线相连,并在空间某点处于静止状态,细线被拉紧,此时回形针受____个力的作用。当将铁片插入磁铁与回形针之间,回形针将____(填“自由下落”或“保持静止”)。
—Can you tell me _______ it is from your home to school?
—It's about three kilometres.
若复数z满足方程z2+2=0,则z3= ( )