按传出神经末稍释放的递质不同，将传出神经分为（） A.中枢神经和外周神经 B.感觉神

直线l的方程为Ax+By+C=0，当A＞0，B＜0，C＞0时，直线l必经过（　　）

A．第一、二、三象限

B．第二、三、四象限

C．第一、三、四象限

D．第一、二、四象限

阅读短文，回答问题。

    Jim asks his friend Li Lei, "How many days are there in a week?"

    "Why? Seven of course. Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and

Saturday." Li Lei answers.

    "Well, Li Lei, can you name five days of the week and not say Sunday, Monday,

Tuesday, Wednesday, Thursday, Friday and Saturday."

    "No, I can't. Can you?" asks Li Lei.

    "Yes, I can. They are today, tomorrow, the day after tomorrow, yesterday, the day

before yesterday."

1. _______________ is the first day of the week.

2. "of course"的中文意思是________________.

3. Can Li Lei name the seven days of a week? _________________.

4. How many days are there in a week? _______________.

5. If (如果) today is Thursday, then the day after tomorrow is ________________.

在太阳能、风能、水能和煤炭中属于化石能源的是______．化石能源的使用促进了人类社会的发展，但也带来了一些弊端．请举出一个化石能源的使用对环境造成不良影响的例子______．

危险物品，是指（）。等能够危及人身安全和财产安全的物品。

A.易燃易爆物品

B.危险化学品

C.放射性物品

D.易碎品

反映货流在时间上分布不平衡的指标是()

A．货流景密度

B．******

C．货运不平衡系数

D．******