问题 多项选择题

下述哪些征象提示腮腺肿瘤为恶性可能

A.肿块境界不清,呈弥漫性浸润

B.肿瘤中心坏死,显示低密度区或浓淡不均

C.肿瘤外形规则,呈圆形

D.肿块边界光滑,增强扫描均匀强化

E.颈部淋巴结肿大

答案

参考答案:A,B,E

解析:ABE提示为腮腺恶性肿瘤可能;CD提示为良性可能。

选择题
完形填空

Big schoolbags have been a serious problem for students for a long time. Maybe your schoolbag is too         to carry, and it troubles you a lot        you want to find a book out to read. Now an e-­textbook will         you.

It is said that e-textbooks are going to be        in Chinese middle schools. An e­-textbook, in fact, is a small          for students. It is much        than a usual schoolbag and easy to carry. Though it is as small as a book, it can       all the materials (材料) for study. The students can read the text page by page on the        , take notes with the pointer (屏写笔). Or even “        ” their homework to their teachers by sending e­mails. All they have to do is to press a button.

Some people say e-­textbooks are good, but some say they may be        for the students' eyes. What do you think of it?

小题1:A. light             B. heavy        C. useful        

小题2:A. till              B. after            C. when

小题3:A. trouble           B. prevent       C. help    

小题4:A. used              B. kept             C. invented 

小题5:A. computer          B. radio            C. pen      

小题6:A. heavier           B. lighter          C. cheaper      

小题7:A. hold              B. build            C. discover     

小题8:A. blackboard            B. desk           C. screen       

小题9:A. find out          B. hand in          C. get back     

小题10:A. helpful              B. famous       C. bad