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【单选题】
D公司在线视频业务全国排名前五，整个业务系统全部建设在阿里云之上，使用的云产品有云服务器ECS、对象存储OSS、内容分发网络CDN。 最近发现有黑客恶意下载公司的正版视频，在国外社区里分发。 假设你是D公司的系统管理员，从技术上可以如何解决这个问题？A.
启用阿里云CDN的IP黑名单功能
B.
启用阿里云CDN的URL鉴权功能
C.
启用阿里云OSS的Refer黑名单功能
D.
启用云服务顺的功能
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反馈参考答案：
举一反三
【简答题】简述果蔬原料分级、清洗的目的和主要方法。
【单选题】Could you ___ the light, please? It's too dark here.
A.
turn down
B.
turnup
C.
turn on
D.
turn off
【简答题】果蔬原料分级的目的和方法？
【单选题】Section A 听力原文：W: It's awfully dark for 4 o'clock. Do you think it's going to rain? M: You'd better do something about that watch of yours. It must have stopped hours ago. Nine says 7. Q: What conclus...
A.
Neither of their watches keeps good time.
B.
The woman's watch stopped 3 hours ago.
C.
The man's watch goes too fast.
D.
It's too dark for the woman to read her watch.
【单选题】— It's too dark and I can't see it clearly. Would you mind _____ the light? — No problem. [ ]
A.
to turn on
B.
turning on
C.
to turn off
D.
turning off
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