水果中维生素B1、维生素B2含量较高。( )
参考答案：错
解析：水果中维生素B1、维生素B2都不高。
She ought to stop _____ she has a headache because she _____ too long. [ ]
A. to work, was reading
B. to work, has read
C. working, has read
D. working, read
准确形象描述磁体磁场的磁力线是（）。
A.互不交叉的闭合曲线
B.起于Ｎ极止于Ｓ极的曲线
C.起于Ｓ极止于Ｎ极的曲线
