异烟肼中毒所致精神障碍的机制哪种说法不正确（） A.发病机制尚未完全清楚 B.与维生
题型：单项选择题
问题：
异烟肼中毒所致精神障碍的机制哪种说法不正确（）
A.发病机制尚未完全清楚
B.与维生素B6的缺乏有关
C.与维生素B12的缺乏有关
D.与烟酸的缺乏有关
E.与儿茶酚胺的代谢异常有关
题型：单项选择题
第二部分：阅读理解（10小题，每小题2分，满分40分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该选项标号涂黑。
We have two daughters: Kristen is seven years old and Kelly is four. Last Sunday evening, we invited some people home for dinner. I dressed them nicely for the party, and told them that their job was to join Mommy in answering the door when the bell rang. Mommy would introduce them to the guests, and then they would take the guests' coats upstairs and put them on the bed in the second bedroom.
The guests arrived. I introduced my two daughters to each of them. The adults were nice and kind and said how lucky we were to have such good kids.
Each of the guests made a particular fuss over Kelly, the younger one, admiring her dress, her
hair and her smile. They said she was a remarkable （出色的、独特的）girl to be carrying coats upstairs at her age.
I thoug
ht to myself that we adults usually make a big "to do" over the younger one because she's the one who seems more easily hurt. We do it with the b
est of intentions
But we seldom think of how it might affect the other child. I was a little worried that Kristen would feel she was being outshined（突出的、优秀的）. I was about to serve dinner when I realized that she had been missing for twenty minutes. I ran upstairs and found her in the bedroom, crying.
I said, "Wh
at are you doing, my dear?"
She turned to me with a sad expression and said, "Mommy, why don't people like me the way
they like my sister? Is it because I 'm not pretty? Is that why they don't say nice things about 
me as
much?"
I tried to explain to her, kissing and hugging her to make her feel better.
Now, whenever I visit a friend's home, I make it a point to speak to the elder child first.
61. The underlined expression ' make a big "to do" over' (paragraph 4) means ______.
A. show much concern about B. have a special effect on
C. list jobs to be done for D. do good things for
62. The guests praised Kelly for carrying coats upstairs because of her ______.
A. beautiful hair B. pretty clothes C. lovely smile D. young age
63 Kristen felt sad and cried because ______.
A. the guest gave her more coats to carry
B. she didn't look as pretty as Kelly
C. the guests praised her sister more than her
D. her mother didn't introduce her to the guests
64. We can conclude from the passage that ______.
A. parents should pay more attention to the elder children
B. the younger children are usually more easily hurt
C. people usually like the younger children more
D adults should treat children equally