心迷走神经叙述正确的有（） A.其节前纤维起源于延髓 B.与心内神经节形成突触联系

阅读短文，选择正确答案。

    When I was young, I looked forward to my birthday all year. On that day, my friends and family made me

feel like the most special person in the world. 　　

    The night before my birthday each year, my parents crept into my bedroom while I was sleeping. They hung

balloons on my walls with a big sign that said Happy Birthday! When I woke up, I was always surprised! 　　

    If my birthday was on a school day, I brought in treats to share with my teachers and classmates. On the

weekend, I invited my closest friends to a birthday party. 　　

    When I was young, I had parties at my house. My parents made up lots of fun games to play. We painted

pictures, played outside, and ate lots of cake and ice cream. My friends brought gifts for me, and my parents

and I gave my friends small bags full of sweets called “goody bags”. 　　

    When I got older, I had birthday parties in different places. One year, I had a party at a bowling alley. Another

year, I had a roller-skating party. In middle school, my parents let me have sleepover parties. My friends and I

stayed up all night watching movies, chatting, and sharing secrets. At night we ate pizza and cake, and the next

morning my parents made pancakes for everyone. 　　

    The saddest day of the year for me was the day after my birthday. Then I knew I had to wait another whole

year before it would come again.

1. The writer was surprised when he woke up on his birthday because ________. [ ]

A. many people had already come to his birthday party 　　

B. his friends had brought many beautiful gifts for him 　　

C. he saw balloons with a sign that said Happy Birthday 　　

D. his parents had made him a cake and some ice cream

2. When he was young, he had his birthday parties ________. [ ]

A. at school　　　　　　　　　　　　　

B. at home 　　

C. on roller-skating grounds　　　　　

D. at bowling alleys

3. We can infer from the last paragraph that ________. [ ]

A. his birthday was his favorite day of the year 　　

B. no one would care about him after his birthday 　　

C. the day after his birthday was an unlucky day 　　

D. he felt sad when people left him after his birthday

4. The writer mainly tells us ________. [ ]

A. what he did on his birthday parties 　　

B. where he had his birthday parties 　　

C. who were invited to his birthday parties 　　

D. how he spent his childhood birthdays

行业领袖供应商的（）、经营品种多、财务状况较好。

A.生产规模小

B.生产规模大

C.技术成熟

D.市场份额大

某固定资产原值为6000元，预计净残值为240元，使用年限为4年，若采用双倍余额递减法计提折旧，则第3年应计提的折旧额为( )元。

A．530

B．630

C．730

D．830

设光栅平面、透镜均与屏幕平行，则当入射的平行单色光从垂直于光栅平面入射变为斜入射时，能观察到的光谱线的最大级数( )。

A．变大
B．变小
C．不变
D．无法确定

在三相四线制中，为什么中线不允许断开？