Mrs. Taylor has ______ 8 years old daughter who has ______ gift for painting—she has wontwo national prizes. 答案是 an 和 a,为什么?第一个空后面不是有从句吗,为什么不能填 the?
The conventional theory is that people yawn when bored or sleepy because yawning raises blood oxygen levels, which in turn raises alertness.whchi in turn 在这里不是否定吧?是进一步吗?