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问题 单项选择题

脑组织在正常情况下主要利用葡萄糖供能，只有在下述哪种情况下脑组匀主要利用酮体

A．剧烈运动

B．空腹

C．短期饥饿

D．长期饥饿

E．轻型糖尿病

答案

参考答案：D

选择题

下列关于无机盐的叙述，错误的是[ ]

A．缺铁性贫血是因为体内缺少Fe2+，血红蛋白不能合成

B．Mg2+是叶绿素的成分之一，缺少Mg2+影响光合作用

C．细胞中的无机盐大多数以化合物形式存在，如碳酸钙是构成骨骼、牙齿的主要成分

D．碘是合成甲状腺激素的原料之一，所以常在食盐中加碘
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Gary has a robot. It is made in the USA. It looks小题1:l       a real person. On the face of the robot, there are two big小题2:e      . In fact, they are cameras. The robot小题3:u       them to take photos of everything it sees. Also the robot has a speaker as its mouth. It can talk to people and小题4:a            their questions. It is humorous. It can tell a lot of jokes and make people laugh. The robot also has two小题5:a          connected to its chest. At the end of each arm, there is a 小题6:h      , so the robot can do whatever it is asked to, such as sweeping the floor, 小题7:d      the laundry and making the bed. Sometimes it can help him go 小题8: s       at the supermarket. The robot stands on four small wheels. It can use them to move around 小题9:e      . It never goes wrong. Gary is satisfied 小题10:w        it. It has become his best friend.
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