最少用______个相同的三角形可以拼成一个平行四边形.
如图:
至少用2个相同的三角形可以拼成一个平行四边形;
故答案为:2.
It was________that many people were injured in the accident.
A.reported
B.to be reported
C.reporting
D.report
离体培养条件下,茎、芽和根的再生方式大致有几种?