一支队伍匀速前进，通信兵从队尾赶到队首又立即返回，当通信兵回到队尾时，队伍已前进

同一强度等级的同条件养护试件不应少于三组。

When my first wartime Christmas came, I was in basic training in New Jersey and not sure if I could make it home for the holidays. Only on the afternoon of December 23 was the list of men who would have three-day holidays posted. I was one of the lucky soldiers. It was Christmas eve when I arrived home, and a light snow had fallen. Mother opened the front door. I could see beyond her, into the corner of the living room where the tree had always stood. There were lights, all colors, and ornaments (装饰物) shining against the green of a pine. “Where did it come from?” I asked.

“I asked the Gates boy to cut it,” my mother said. “I wouldn’t have had one just for myself, such a rush！He just brought it in this afternoon…” The pine reached to the proper height, almost to the ceiling, and the tree top crystal star was in its place. A few green branches reached about a little awkwardly at the side, I thought, and there was a bit of bare trunk showing in the middle. But the tree filled the room with warm light and the whole house with the pleasant smell of Christmas. “It’s not like the one you used to find,” my mother went on. “Yours were always in good shape. I suppose the Gates boy didn’t know where to look for a good one. But I couldn’t be fussy (挑剔的)．”

“Don’t worry,” I told her. “It’s perfect.” It wasn’t, of course, but at the moment I realized something for the first time: all Christmas trees are perfect．

小题1:From the passage, we can infer that ______．

A．the writer spent his first Christmas during the war

B．soldiers did not all go home for Christmas during the war

C．all the soldiers had three-day holidays

D．the writer could not go home for Christmas小题2:When the writer got home, ______．

A．it was December 23th

B．it was snowing heavily

C．he found a Christmas tree in the living room

D．the Gates boy was cutting a Christmas tree for his mother小题3:From this passage，we can conclude that ______．

A．the writer used to cut very beautiful Christmas trees

B．his mother didn’t like perfect trees

C．his mother didn’t want to have a tree

D．the writer wouldn’t have a tree cut by someone else小题4:“All Christmas trees are perfect”，because they can remind you of ______．

A．the wartime

B．the green of a pine

C．the pleasant smell

D．the sweet home小题5:The best title for this passage would be “______”．

A．How to Choose a Christmas Tree

B．How Soldiers Spent Christmas

C．The Perfect Christmas Tree

D．The Christmas Without a Tree

某物质中可能有甲醇、甲酸、乙醇、甲酸乙酯几种物质中的一种或几种，在鉴定时有下列现象：

①有银镜反应；②加入新制的Cu(OH)₂，沉淀不溶解；③与含有酚酞的NaOH溶液共热时发现溶液中红色逐渐变浅。

下列叙述正确的是 [ ]

A．有甲酸乙酯和甲酸

B．有甲酸乙酯和乙醇

C．有甲酸乙酯，可能有甲醇

D．几种物质都有

论述物流推进型控制和物流拉动型控制的原理

右侧标志表示干路车辆优先通行。