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【单选题】
以下列生物膜 “ 流动镶嵌模型 ” 描述正确的是A.
脂膜由脂双层构成，内外表面各分布一层球状蛋门质
B.
脂膜由脂双层构成，中间有一层蛋白质
C.
脂膜由脂双层构成，蛋白质以不连续的颗粒形式嵌入脂层，脂分子可以移动，蛋白质不能移动
D.
脂膜由脂双层构成，蛋白质以不连续的颗粒形式嵌入脂层，脂分子和蛋白质的均呈流动状态
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【单选题】Which of the following statements is correct about propagation rules?
A.
In the MF/HF band, Iow frequency is selected for long distance communication.
B.
The frequency selected during nighttime is lower than that selected during the daytime if the receiver is the same one.
C.
In the MF/HF band, the frequency selection bas nothing to do with the communication distance.
D.
The frequency selected during daytime is lower than that selected during the night time if the receiver is the same one.
【单选题】听力原文： Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans bad anything more th...
A.
Botany is a very ancient learning.
B.
People in the Stone Age knew a lot about plants.
C.
People in the Stone Age knew little about plants.
D.
Pre-industrial societies have little insights about plants.
【单选题】According to Bas Lansdorp, which of the following is NOT TRUE?
A.
For a one-way trip to Mars, all the technology exists.
B.
He could not come up with the fund for Mars One.
C.
We humans have the rockets to send people to Mars.
D.
We humans have the equipment to land on Mars.
【简答题】孩子们那么兴奋并不奇怪--这是他们第一次出国。 No the children are excited- this is the first time they've been abroad.
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