评述式导语

四类免费乘车人员每次乘车进出地铁付费区时须主动（）并在（）处办理登记手续。

看图读对话，选择符合图意的对话，将其序号填入图下括号内。

      ( )         ( )          ( )            ( )          ( )

1. A: What time do you get up?

    B: At six o'clock.

    A: Does your brother get up earlier than you?

    B: No. He gets up later.

2. A: When is your birthday?

    B: It's on the first of July.

    A: Would you like a puppet as a birthday present?

    B: Yes, please.

3. A: Let's go to the park.

    B: Good idea. But how do we go there?

    A: Let's go on foot.

    B: All right. Let's go.

4. A: Shall we go and play football?

    B: Sorry, I can't. I'm writing an e-mail to my penfriend.

    A: That's all right.

5. A: Excuse me, can you tell me the way to the toilet?

    B: Go along this street, and then turn right at the first crossing. 

       The toilet is on your right. You can't miss it.

    A: Thank you very much.

    B: You're welcome.

上颌窦癌因为骨壁所限，T₁病变不易被发现，以下哪种症状已是T₂病变（）

A.张口严重受限

B.面部肿胀、隆起

C.眼球外突、运动受限

D.齿龈和硬腭肿胀、隆起

E.以上都不是T₂病变表现

铬元素的表示方法为（）。

A．Cu

B．Cr

C．Ce

D．Cl

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A. loop B. find C. search D. query