— The rape flowers in Xinghua ______ beautiful in April.

— Yes, many tourists come to watch them every year.

A．sound

B．listen

C．taste

D．look

人胚骨化开始于胚胎第6周，最先骨化的是()

A．股骨

B．胫骨

C．锁骨

D．掌骨

E．肩胛骨