高压氨水的三通阀，在不装煤时，一般高压氨水阀门应处于（）状态。

减数分裂后形成的细胞里含有（）倍数的染色体。

A、单

B、双

C、三

D、四

长期股权投资的初始投资成本大于投资时应享有被投资单位可辨认净资产公允价值份额的，差额部分不调整长期股权投资的初始投资成本。( )

下列关于对了望人员的要求说法正确的有：（）

Ⅰ、瞭望人员应具有健康的身体素质，尤其是能适应视觉和听觉了望的基本要求

Ⅱ、不论船上人员的多少，了望人员只能由合格的、称职的航海人员来担任

Ⅲ、只要具有健康的身体素质，能适应视觉和听觉了望的基本要求的船员均可作为瞭望人员

A.Ⅰ

B.Ⅰ、Ⅲ

C.Ⅰ、Ⅱ

D.Ⅰ、Ⅱ、Ⅲ

阅读理解。

     Teeth are important. Strong, healthy teeth help you chew foods that help you grow. They help you speak

clearly. And, they help you look your best. Here are some tips for you to take care of your teeth.

     1. Brush your teeth on the right way.

     Brush your teeth at least twice a day-after breakfast and lunch or after sweet snacks, too. Brush all of your

teeth, not just the front ones, spend time brushing teeth along the sides and back of your mouth. Brush away

from your gums, too.

     Spend at least three minutes each time you brush. Play a song you like to help pass the time. Get a new

toothbrush every three months. When you buy your toothbrush,be sure it has soft bristles (毛).

     2. Learn how to floss your teeth.

     Flossing is a very important way to keep your teeth healthy. Food may hide in places where a toothbrush

cannot get to, like the space between two teeth. Flossing can help get rid of it. Carefully move floss between

two teeth. Up and down. You'll need to floss your teeth at least once a day.

     3. Have good eating habits.

     You need to be careful about what you eat and drink. Eating sugar is a major of tooth decay (腐败). Eating

sugar before you go to bed can make things even worse, eat lots of fruit and vegetables and drink water instead

of soda.

1. The passage is mainly about _____.

A. how to take care of your teeth

B. how to brush your teeth

C. how to form good eating habits

D. how to floss your teeth

2. The underlined word "tips" in this passage means _____.

A. money given to the waiter for personal services

B. piece of advice on how to do something

C. light blow, tape

D. thin end of something

3. When you brush your teeth, at least _____ minute(s)is necessary.

A. 1

B. 2

C. 3

D. 4

4. Which is NOT mentioned in this passage?

A. Flossing your teeth.

B. Having good eating habits.

C. Brushing your teeth.

D. Going to see the dentist.

5. Which of the following statements is NOT true according to this article?

A. We should brush our teeth at least twice a day.

B. Flossing can help to get rid of the food hidden between two teeth.

C. One of the major causes of tooth decay is eating sugar.

D. We don't have to brush our teeth if we eat a lot of fruit and vegetables.

有权决定全国或者个别省、自治区、直辖市进入紧急状态的国家机关是______。

A．国务院
B．全国人民代表大会常务委员会
C．中央军事委员会
D．国家 * *