白芷的断面特征为（） A．基原鉴定 B．性状鉴定 C．理化鉴定 D．显微鉴定 E．生

人的性别决定于下列哪个时期（　　）

A．受精卵形成时

B．生殖细胞形成时

C．婴儿出生时

D．青春期

阅读理解。

        Everyone has got two personalities - the one that is shown to the world and the other that is secret

and real．You don't show your secret personality when you're awake because you can control your

behaviour，but when you're asleep， your sleeping position shows the real you．In a normal night，of

course，people frequently change their position．The important position is the one that you go to sleep

in．

        If you go to sleep on your back，you're a very open person．You normally trust people and you are

easily influenced by fashion or new ideas．You don't like to upset people，so you never express your real

feelings．You're quite shy and you aren't very confident．

        If you sleep on your stomach，you are a rather secretive（不坦率的）person．You worry a lot

and you're always easily upset．You're very stubborn（顽固的），but you aren't very ambitious．You

usually live for today not for tomorrow．This means that you enjoy having a good time．

        If you sleep curled up（卷曲），you are probably a very nervous person．You have a low opinion

of yourself and so you're often defensive．You're shy and you don't normally like meeting people．You

prefer to be on your own．You're easily hurt．

        If you sleep on your side，you have usually got a well-balanced personality．You know your

strengths and weaknesses．You're usually careful． You have a confident personality．You sometimes

feel anxious，but you don't often get depressed．You always say what you think even if it annoys

people．

1．According to the writer，you naturally show your secret and real personality __________.

A．only in a normal night

B．only when you go to sleep

C．only when you refuse to show yourself to the world

D．only when you change sleeping position

2．Which is NOT mentioned in the second paragraph about a person's personality？

A．He or she is always open with others．

B．He or she always likes new ideas earlier than others．

C．He or she is always easily upset．

D．He or she tends to believe in others．

3．Point out which sentence is used to show the personality of a person who is used to sleeping on his or

her stomach？

A．He or she is careful not to offend others．

B．He or she doesn't want to stick to his or her opinion．

C．He or she can't be successful in any business．

D．He or she likes to bring others happiness．

4．Maybe you don't want to make friends with a person who sleeps curled up．Why？

A．He or she would rather be alone than communicate with you．

B．He or she is rarely ready to help you．

C．He or she prefers staying at home to going out．

D．He or she wouldn't like to get help from you．

5．It appears that the writer tends to think highly of the person who sleeps on one side because _____ ．

A．he or she always shows sympathy for people

B．he or she is confident，but not stubborn

C．he or she has more strengths than weaknesses

D. he or she often considers annoying people

近代化学的奠基人，近代化学之父是谁（）

A、拉瓦锡

B、道尔顿

C、海尔蒙特

D、波义耳

* * 的组织形式是调整国家整体和部分之间的机构关系的形式。 ( )

某商品流通企业计划期需采购某种商品400吨，现有甲、乙、丙、丁四家供应商可供选择，他们供应的商品质量均符合国家标准，信誉均较好。甲供应商报价为4200元/吨，运费为20元/吨，订购费用为200元；乙供应商报价为4100元/吨，运费为25元/吨，订购费用为400元；丙供应商报价为4000元/吨，运费为30元/吨，订购费用为800元；丁供应商报价为3900元/吨，运费为100元/吨，订购费用为1000元。该商品流通企业经过采购成本比较，选择了采购总成本最低的（）供应商。

A．甲

B．乙

C．丙

D．丁