皮皮学，免费搜题
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搜题
【单选题】
细菌外毒素的化学成分主要是A.
蛋白质
B.
肽聚糖
C.
核酸
D.
脂多糖
E.
脂蛋白
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皮皮学刷刷变学霸
举一反三
【单选题】If you want to be creative, you have to ______ your surroundings.
A.
ask
B.
avoid
C.
understand
D.
take in
【判断题】Being familiar with the surroundings has a positive effect on your presentation.
A.
正确
B.
错误
【单选题】You stare at waterfall for a minute or two, and then shift your gaze to its surroundings. What you now see appears to drift upward. These optical illusions occur because the brain is constantly matchi...
A.
matched to six to seven million structures called cones.
B.
confused in the body’s sensors of both rods and cones.
C.
interpreted in the brain as what must be the case.
D.
signaled by about 120 million rods in the eye.
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