[单选题]单选题：电话闭塞法组织行车时，闭塞解除后按规定将路票划“×”注销，并留存（ ），以备查验。
A.一周
B.一个月
C.一个季度
D.一年

Daily social relations in France have always been dominated by family ties. The family has been the focus of the individual’s loyalty and{{U}} (47) {{/U}}, of his economic interest, and even of his{{U}} (48) {{/U}}duty. Many an older Frenchman has spent his youth in a World where the family’s needs and demands were put before those of the local{{U}} (49) {{/U}}or even of the State.
The main change since the war is that the focus of loyalty has been{{U}} (50) {{/U}}narrowing from the"{{U}} (51) {{/U}}family" to the "nuclear family", i.e. the home cell of parents and children. In the rural areas the traditionally big peasant families have lost their influence as the young{{U}} (52) {{/U}}away to the town. And in the upper class families, as{{U}} (53) {{/U}}gives way to income and family management disappears, the tight network of the big family gathering has become less necessary for the individual’s future, and also less easy t