不属于位觉感受器的是()
A. 球囊斑
B. 壶腹嵴
C. 螺旋器
D. 椭圆囊斑
E. 椭圆囊斑、球囊斑、壶腹嵴
A warm thought suddenly came to me _____ I might use the pocket money to buy some flowers for my mother's birtday.
A. when
B. that
C. how
D. what
We haven’t settled the question of _____ it is necessary for him to study abroad.
A. which
B. that
C. what
D. whether