我国发展电子商务需要解决的关键问题（）A.技术问题 B.观念意识 C.基础设施 D.

居民个人拥有的普通标准住宅，在转让时暂减半计征土地增值税。(　　)

社会主义建设时期（1956-1976年），我党曾犯了两次严重的“左”倾错误，给社会主义建设事业造成了巨大的挫折与损失，带给了人们沉痛的教训。

阅读下列材料：   

材料一  《人民日报》连续发表“人有多大胆，地有多大产”“小麦亩产12万斤”“皮棉亩产5 000斤”和“一棵白菜500斤”等文章。   

材料二  “大跃进”时期的宣传漫画肥猪赛大象，就是鼻子短，全社杀一口，足够吃半年

材料三  1966-1968年的国民经济状况（部分）

（1）上述材料所示现象出现的根源是什么？结合材料说明其对中国社会主义经济发展所造成的危害。

（2）材料一、二涉及了哪一重大历史事件？试作简要评价。

（3）针对材料三所示问题，党和政府进行了哪些努力？

（4）我们应从上述材料中得到什么教训？

肺结核空洞可表现为（）

A.虫蚀样空洞

B.薄壁空洞

C.纤维空洞

D.干酪厚壁空洞

E.硬壁空洞

有以下程序
struct STU
char name[10]；
int num；
；
void f1(struct STU C)
struct STU b="LiSiGuo",2042；
c=b；

void f2(struct STU*C)
struct STU b="SunDan",2044；
*c=b；

main()
struct STU a="YangSan",2041,b="Wang Yin",2043；
f1(

When Dave was eighteen, he bought a secondhand car for 200 so that he could travel to and from work more (1) than by bus. It worked quite well for a few years, but then it got so old, and it was costing him (2) much in repairs that he decided that he had better (3) it.

He asked among his friends to see if anyone was particularly (4) to buy a cheap car, but they all knew that it was falling to pieces, so (5) of them had any desire to buy it. Dave’s friend Sam saw that he was (6) when they met one evening, and said, "What’s (7) , Dave"

Dave told him, and Sam answered, "Well, what about advertising it in the paper You may (8) more for it that way than the cost of the advertisement!" Thinking that Sam’s (9) was sensible, he put an advertisement in an evening paper, which read "For sale: small car, (10) very little petrol, only two owners. Bargain at 50. " For two days after the advertisement first appeared, there was no (11) . But then on Saturday evening he had an enquiry. A man rang up and said he would like to (12) him about the car. "All right, " Dave said, feeling happy. He asked the man whether ten o’clock the next morning would be (13) or not. "Fine, " the man said, "and I’ll (14) my wife. We intend to go for a ride in it to (15) it. "

The next morning, at a quarter to ten, Dave parked the car in the square outside his front door, (16) to wait there for the people who had (17) his advertisement. Even Dave had to (18) that the car really looked like a wreck. Then, soon after he had got the car as clean (19) it could be, a police car stopped just behind him and a policeman got out. He looked at Dave’s car and then said, "Have you reported this (20) to us yet, sir\

7（）

A.on 

B.up 

C.it 

D.that