A：有一条直角边对应相等的两个直角三角形全等
B：腰长相等的两个等腰三角形全等
C：斜边相等的两个等腰直角三角形全等
D：两个锐角对应相等的两个直角三角形全等
⑴____ A . ask B . what C . watch D . want
⑵____ A . under B . blue C . up D . but
⑶____ A . window B . how C . now D . down
⑷____ A . school B . good C . book D . football
⑸____ A . would B . about C . trousers D . out
