下列物质中,属于纯净物的是[ ]
A.洁净的空气
B.澄清的石灰水
C.无色汽水
D.蓝色胆矾
答案:D
—Mr Smith, I wonder if I could take the Friday off?
—_______? It’s a bit difficult with so many people away on holiday, you know.
A.Why are you doing so
B.Do you really have to
C.Where are you going
D.Do you feel it necessary
梅特林克的《青鸟》、《不速之客》等作品是______ 戏剧的典型之作。 ( )
A.荒诞派
B.象征派
C.写实派
D.印象派