铅中毒时最主要的是抑制()A.δ-氨基乙酰丙酸合成酶  B.δ-氨基乙酰丙酸脱水酶

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问题:

铅中毒时最主要的是抑制()

A.δ-氨基乙酰丙酸合成酶 

B.δ-氨基乙酰丙酸脱水酶 

C.粪卟啉原氧化酶 

D.粪卟啉原脱羧酶

考点:乡村医生预防医学预防医学题库
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A little boy went to a telephone booth (电话亭) at the cash counter of a store and made a phone call. The store owner looked at him and listened to the conversation.

Boy: “Lady, can you give me the job of cutting your lawn (草坪)?”

Woman (at the other end of the phone line): “No, thank you. I already have someone to cut my lawn.”

Boy: “Lady, I will cut your lawn for half the price the person who cuts your lawn now.”

Woman: “I’m very satisfied with the person who cuts my lawn.”

Boy (with more perseverance 执着) : “Lady, I’ll even sweep the floor and the stairs of your house for free.”

Woman: “No, thank you.”

With a smile on his face, the little boy hung up the phone. The store owner, who was listening to all this, walked over to the boy.

Store owner: “Son... I like your attitude (态度). I like that positive (积极的) spirit and would like to offer you a job.”

Boy: “No, thanks.”

Store owner: “But you were really asking for one.”

Boy: “No, Sir. I was just checking my performance (表现) at the job I already have. I am the one who is working for that lady I was talking to.”

小题1:In fact, how many people are mentioned (提及) in the story?  _____________.

A.2

B.3

C.4

D.5小题2:The boy said to the lady that he would even sweep her floor and stairs for free because ___________.

A.he wanted her to let him continue his job

B.he thought that the lady was too poor

C.the lady thought the money she paid the boy was too much

D.he wanted to know if he did his job well enough and couldn’t be replaced (取代) by others.小题3:Which is TRUE according to the story?

A.The boy was angry with the lady.

B.The store owner wasn’t kind-hearted.

C.The lady wanted to find another person to do the boy’s job.

D.The boy was happy to know that the lady was satisfied with his performance.小题4:The best title for the story is “_____________”.

A.Asking for a job

B.Self-appraisal (自我测评)

C.The lady and the boy

D.The boy and the store owner

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4000-(2580+2880÷16)

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( 3分)有一瓶硫酸钠溶液可能混有少量氯化钠,请设计实验方案检验溶液中氯化钠是否存在:_______________________________________________________________

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实践研究法主要包括()。

A.观察法

B.问卷调查法

C.访谈法

D.实验法

题型:单项选择题

麻疹皮疹的特点,下列叙述错误的是()

A.发热3~4天出疹

B.发疹有一定顺序

C.始为玫瑰色斑丘疹

D.疹间有正常皮肤

E.疹退后面部有糠屑样脱皮,四肢有大片状脱皮

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