The origin of the American party system can be traced to ________.
佝偻病激期最主要的表现是（）
The proposal deserves support as it gives ______ to the needs of children.
The professor worked for 7 hours at a ________.
In 1900, the energy derived from burning petroleum was only four percent ______ of coal.
乳牙出齐的年龄是（）
The students are required to ________ the main ideas of the article in their own words.
Jeans are so hot these days that big name stars appear on TV advertising for their ______ brands.
不符合腹泻患儿护理诊断的是（）
新生儿败血症出生后最常见的感染途径是（）