My mother is cooking in the kitchen _______.
A：at the moment
B：in a moment
C：for a moment
D：with a moment
—No, you _______.
善于观察是人类获得智慧的重要方式。通过观察水烧开时蒸汽顶开壶盖现象，促成工业革命一项伟大发明的科学家是（ ）
Mary's dress is very similar________mine but they differ________quality.
