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【单选题】
将明信息变换为密信息称为加密，将密信息变换为明信息称为解密。下列属于加密的是（ ）A.
教职工大会上，科技处负责人对大家说：“你们电子信箱的密码都是2004。”
B.
和爱人约定，谁后出门谁一定要把门窗关好，特别是防盗门要锁好。
C.
对说：“我登上山顶后，如果左手拿一本杂志在挥舞就说明风很大，你就不要上去。”
D.
小张的电脑经常有人随意打开，最近发现了大量病毒，为防止文件丢失，小张对自己的电脑重新进行了设置，用中英文字母和数字锁了起来。
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反馈参考答案：
举一反三
【多选题】With( )the fare for the flight is paid in advance generally
A.
passengers
B.
a member of the public
C.
freight
D.
large shipper
【单选题】听力原文：W：Sorry，sir．The flight is somewhat behind schedule． M：Thank you．You will tell us as soon as you know something definite，won't you? Q：What can we learn from the conversation? (18)
A.
The plane is full.
B.
The plane is late.
C.
The plane has broken down.
D.
The flight is canceled.
【单选题】听力原文：M: So, when are the other guys going to get here? The flight is taking off in 45 minutes. They'll stop boarding in 5 minutes. W: It's 10:30 already. They were supposed to be here ten minutes ago....
A.
At10:30.
B.
At10:20.
C.
At11:15.
D.
At10:45.
【单选题】下列说法正确的是（）。
A.
木本园林植物最主要的特征是树干高大
B.
竹类植物根据地下茎的生长特性可分为丛生竹和散生竹两类
C.
多年生花卉一般地下部分都变态肥大
D.
紫玉兰、栀子都属于灌木
【简答题】A．The flight is taking its regular route. B．The airport is closed due to bad weather. C．The closure affected the airport's schedule. D．The plane will fly back to its point ~ departure.
【单选题】______ the flight is canceled, the seminar will have to be postponed.
A.
While
B.
if
C.
Although
D.
Besides
【简答题】A．The airport is closed due to bad weather. B．The flight is following its regular schedule. C．The plane will return to its point of departure. D．An earlier closure affected the airport's schedule.
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