学制小于四年的本科生，须在规定的课程模块中选够（）个学分。
A.1
B.2
C.3
D.4
参考答案：C
It’s really unwise of some teenagers from low-income families to spend a large sum of money on Apple products ______ they could buy other cheaper brands.
A．unless
B．when
C．so that
D．in case
脊髓的副交感中枢位于（）
A.S1~3侧角
B.L3～S3侧角
C.T12～L3侧角
D.S2~4侧角
E.S4~5侧角
