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【判断题】
碳水化合物统称为糖类,是由碳、氢、氧三种元素组成的一大类化合物。在这类化合物中有许多氢与氧的比例数和水一样,因此常被称为碳水化合物。A.
正确
B.
错误
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【单选题】根据材料请回答 46～50 What Makes Me the Weight I Am? There's no easy answer to this question.Your genetic makeup, the physical traits that get passed down to you from your parents, plays a big part in determi...
A.
That's why it's possible for two kids with the same height, but different weights, to both be the right weight.
B.
If you .eat more calories' than your body needs to use, you will gain too much weight.
C.
Poor eating and exercise habits also run in families and this may be the reason the members of a family are overweight.
D.
However, many overweight people have difficulty reaching their healthy body weight.
E.
On the other hand, if you eat less and exercise more, you may lose weight.
F.
If both your parents are tall, there is a good chance you'll be tall. 第 46 题 请选择（46）处的最佳答案
【单选题】在下列选项中,关于市场机制,说法错误的是()。
A.
市场机制允许市场主体自发的进行交易
B.
当市场机制受到政策限制时,帕累托改进可能会没有效率
C.
帕累托效率只能存在于市场竞争机制中
D.
市场机制允许潜在的帕累托改进
【单选题】下列有关天文知识的表述，正确的是（ ）
A.
开普勒制成人类历史上第一台天文望远镜，并证实了哥白尼学说
B.
四象青龙、白虎、朱雀、玄武分别代表东、西、南、北四个方向
C.
世界最早的哈雷彗星记录是《诗经》中的“鲁庄公七年星陨如雨”
D.
月食发生时地球、月球、太阳在一条直线上，且月球居中
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