在标准状况下,将w g A气体(摩尔质量为M g/mol)溶于1L水中,所得溶液密度为dg/mL,则此溶液的物质的量浓度为( )
One of the most important questions they had to consider was _____ of public health.
Encourage your children to try new things, but try not to ___ them too hard.
The computer was used in teaching. As a result, not only__________, but students became more interested in the lessons.
The children all turned ____ the famous actress as she entered the classroom.
Edward, you play so well. But I ______ you played the piano.