遗传性痉挛性截瘫主要影响脊髓的哪个部位（）
A.皮质脊髓束
B.前庭脊髓束
C.脊髓后索
D.脊髓小脑束
E.以上均不正确
参考答案：A
一寸光阴一寸金，寸金难买寸光阴。下列各过程经历的时间最接近1s的是
A．人眼睛迅速眨一下
B．人心脏正常跳动一次
C．人做一次深呼吸
D．人跑50m
—Did you make sense of what the man said just now?
—No, his meaning didn’t ______ ．Would you explain it to me?
A．get through
B．get off
C．get across
D．get out
