皮皮学，免费搜题
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搜题
【单选题】
对气体交换影响不大的因素是( )。A.
呼吸膜两侧的PC02和P02
B.
肺活量
C.
通气/血流比值
D.
温度变化
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】You are about to go onstage to give a presentation. Though you have prepared well, your hands have started to shake and your knees are feeling weak. What do you do?
A.
Take a deep breath, visualize your success and hold onto the lectern when you are onstage.
B.
Quickly find someone else to give your presentation.
C.
Call off the presentation.
D.
Go get a glass of water or something small to hold onto.