单位工程施工起点流向，是指（）施工开始的部位及其流动方向。A、竖向空间上 B、平面空间

阅读理解。

     On a Friday night, a poor young violinist was playing his violin at the entrance of the sub-way station.

The music was so great that people slowed down to listen and put some money into his hat.

     The next day, the violinist came to the entrance again. He put down his hat as usual. Be-side the hat

was a piece of paper with some words on it. It said, A George Sang has put an important thing into my

hat by mistake.

     "Welcome to claim it." Soon the people were attracted by the words and wondered what it could be.

After a while a man rushed through the crowd, took it! violinist's shoulders and said, "I knew you would

certainly come here." The violinist asked, "Did you lose something?" "Lottery." The violinist took out

lottery ticket with Sang's name on it. Sang took it and danced happily.

     Sang was an office worker. He bought the lottery and won a prize of $500,000. But when he gave $50

to the violinist for his wonderful music, the lottery ticket was thrown in, too. The violinist was a college

student. This morning, he was going to fly to Vienna for high education. However, when he found the

ticket, he cancelled the flight and returned to the entrance.

     Later someone asked the violinist why he didn't take the lottery ticket to pay the tuition fee. He said,

"Although I don't have much money, I live happily. If lose honesty, I won't be happy forever."

1. Why did the young man play the violin at the entrance?

A. For pleasure.

B. To earn money.

C. For love.

2. What did George Sang put into the violinist's hat on a Friday night by mistake?

A. Money.

B. Lottery.

C. Money and lottery.

3. George Sang was very _____ to see the young violinist the next day.

A. worried

B. sorry

C. happy

4. What does the underlined word "cancelled" in the fourth paragraph mean?

A. 增加

B. 取消

C. 上升

5. What's the best title for this passage?

A. The Meaning of Honesty.

B. An Office Worker and a Lottery Ticket.

C. The Wonderful Violin Play.

可用于食管癌普查筛选检查的简便易行的方法是（）.

A.CT 

B.MRI 

C.食管镜 

D.食管脱落细胞学检查 

E.食管吞钡X线检查

下列用电器正常工作10秒钟消耗电能最少的是

A．手电筒的小灯泡

B．电视机

C．洗衣机

D．空调

某项目的总投资为1200万元，其年收入为1950万元，年税费及附加为410万元，年总成本费用为1300万元。则该项目的投资利润率为（ ）。

A．20%.

B．40%

C．54%

D．63%

We have already covered the topic of network addresses. The first （1） in a block (in class A, B, and C) defines the network address. In classes A, B, and C, if the hosted is all 1 s, the addressis called a direct broadcast address. It is used by a （2）to send a packet to all hosts in a specificnetwork. All hosts will accept a packet having this type of destination address. Note that thisaddress can be used only as a （3） address in an IP packet. Note also that this special addressalso reduces the number if available hosted for each netid in classes A, B, and C.

In classes A, B, and C, an address with all 1 s for the netid and hosted (32 bits) define a （4） address in the current network. A host that wants to send a message to every other hosts can use this address as destinationaddress in an IP packet. However, a router will block a packet having this type of address to confine thebroadcasting to the （5） network. Note that this address belongs to class E.

（3）是（）

A.source

B.destination

C.local

D.remote