计划生育政策()形成我国人口老龄化的原因。
参考答案:并不是
In 1911, Madame Curie received a second Nobel Prize for her research, the first person in the world ______ two Nobel Prizes.
A.receiving
B.received
C.to receive
D.being received
分析下列旋律的调式、调性,如有转调请写明前、后的调名。