皮皮学，免费搜题
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搜题
【单选题】
下列选项中，不一定是人类对生态系统的干扰的是______A.
砍伐森林
B.
森林大火
C.
过度放牧
D.
过度捕捞
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】---Hello! 458-6777. ---Hello! ______. ---Yes, please hold on.
A.
May I speak to Jack?
B.
Jack isn’t in.
C.
What can I do for you?
D.
What’s your name?
【单选题】-----Hello, is that Jack speaking ? ----- _______.
A.
I am Jack
B.
This is Jack
C.
Who are you
D.
No ,you may not
【简答题】利用一定的刃部轮廓的砂轮磨掉硅片边缘的棱角，使之变得光滑的工艺为
【简答题】完成对话，每空一词 Lucy: Hello, Jack. Jack: Hello, Lucy. Who is that boy 1 blue? Lucy: 2 name is Bill. Jack: 3 4 is he? Lucy: He is 12 5 old. Jack: 6 _ is his birthday? Lucy: His birthday is November 11th.