皮皮学，免费搜题
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搜题
【单选题】
用于动物细胞培养的组织和细胞大都取自胚胎或出生不久的幼龄动物的器官或组织，其主要原因是这样的组织细胞 [ ]A.
容易产生各种变异
B.
具有更强的全能性
C.
取材十分方便
D.
分裂增殖的能力强
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The central idea is __________.
A.
A declarative sentence that tells what you hope to accomplish with your speech
B.
A declarative phrase you want your audience to remember in your speech
C.
A single infinitive phrase that indicate what you want to accomplish with your speech
D.
An interrogative sentence that provokes the audience's curiosity and interest
【判断题】the central idea is what you hope to accomplish and the specific purpose of a speech is a concise statement of what you expect to say.
A.
正确
B.
错误
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