属于上运动神经元麻痹的体征是（）。
A.显著的肌萎缩
B.肌束颤动
C.运动觉消失
D.可引出Babinski征
E.肌张力减低
参考答案：D
下列叙述中正确的是
A．一个算法的空间复杂度大，则其时间复杂度也必定大
B．一个算法的空间复杂度大，则其时间复杂度必定小
C．一个算法的时间复杂度大，则其空间复杂度必定小
D．上述三种说法都不对
Smoking, ____ some smokers, might ease their anxiety sometimes, but ____ the addiction caused by their constant practice, it is really hard to give up.
A．according to; due to
B．according to ;because
C．as to; since
D．thanks to;if
