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【单选题】
人类历史的转折点发生在（）。A.
16世纪
B.
17世纪
C.
18世纪
D.
19世纪
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反馈参考答案：
举一反三
【单选题】2 Question 1 to 3 are based on the conversation you have just heard.
A.
Air pollution
B.
Agriculture
C.
Industry
D.
Water
【单选题】3 Question 1 to 3 are based on the conversation you have just heard.
A.
Industry
B.
Cars
C.
Factories
D.
Agriculture
【单选题】1 Question 1 to 3 are based on the conversation you have just heard.
A.
Mine
B.
Gold
C.
Environment issue
D.
Water
【单选题】在ZigBee网络中存在三种设备类型：协调器、路由器和终端设备，但是在ZigBee网络中只能有一个（ ），可以有多个（ ）和多个（ ）。
A.
路由器、协调器、终端
B.
协调器、终端、路由器
C.
路由器、终端、协调器
D.
终端、路由器、协调器
【简答题】ZigBee 网络中有三种类型的节点,分别是()、()和 ZigBee 终端节点。
【单选题】Conversation 1 Question 9 to 11 are based ont the conversation you have just heard. question 9.mp3:
A.
She had a job interview to attend.
B.
She was busy finishing her project.
C.
She had to attend an important meeting.
D.
She was in the middle of writing an essay.
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