川贝母的科属及入药部位为（）
A.兰科，块茎
B.百合科，鳞茎
C.天南星科，块茎
D.茜草科，根及根茎
E.蓼科，块根
参考答案：B
—What's the matter with Philips?
—Something must have happened to him. He left home three hours ago, but ________ at the party!
A．didn't arrive
B．isn't arriving
C．hadn't arrived
D．hasn't arrived
_____ he was ill, _____ he went to school. [ ]
A. Because; so
B. Although; but
C. Because; ／
D. Although; ／
