-- What’ s the weather like?

-- Oh， it       outside. Take an umbrella with you.

A．rains

B．is raining

C．was raining

D．rained

下述哪些征象提示腮腺肿瘤为恶性可能()

A．肿块境界不清，呈弥漫性浸润

B．肿瘤中心坏死，显示低密度区或浓淡不均

C．肿瘤外形规则，呈圆形

D．肿块边界光滑，增强扫描均匀强化

E．颈部淋巴结肿大