甲状腺癌131I显像表现为（）。
A.热结节
B.温结节
C.凉结节
D.冷结节
E.凉结节或冷结节
参考答案：E
With so many orphans ________，the charity organization calls for more donations.
A．to be looked after
B．being looked after
C．to look after
D．looked after
桑葚胚由多少个细胞组成( )。
A．8个B．12个C．16个D．20个E．24个
