His parents,       , didn’t look after him very well—the elbows of his jacket and his boots were badly worn out.

A．generally

B．apparently

C．gradually

D．precisely

体态语言不能在教学信息传递中占主导地位是因为它 （ ）

A．稍纵即逝

B．表意不准

C．难以重复

D．直观性差