发动机排量是指活塞从上止点到下止点所扫过的气体容积。

阅读理解。

                                                                          Healthy eating

     What's the best thing to eat on a hot summer day? Many people would say ice cream. Yes, eating ice

 cream with some fruit on top is a great way to cool down. But think before you eat. If your body is hot

 from playing sports, it's not the best time to eat ice cream.

     When your body is hot, a lot of ice cream may give your stomach some problems, and you could get

 diarrhoea (腹泻). You can eat some ice cream after you've cooled down a bit and had some tea. Just try

  not to eat too much all at once!

     After dinner is another time people shouldn't eat or drink anything cold. Drink something hot after you

 eat, and your stomach will digest (消化) your food better. If you love fruit, summer is a great time for you.

  Go to the market and pick out the best fruit of the season. If you want to stay cool, oranges, bananas,

 pears and watermelons can help. Also, try to eat more ginger and gram. They will help you stay cool and

  healthy.

     In summer, bacteria (细菌) grow very fast and make your food go bad quickly. Try hard to keep

  yourself and your home clean in summer. Always eat clean, fresh food. When you feel like eating a cold

 dish, put vinegar in it to disinfect it. If you can't finish your food and want to eat it again next day, make

 sure you heat it enough to kill the bacteria in it. And when you put food in the fridge, make sure to keep

 the cooked food away from the uncooked food.

     Stay healthy this summer, and enjoy a nice treat now and then. What's inside your favourite snacks?

1. _____ will help you stay cool and healthy.

    A. Fruit                        

    B. Ice cream              

    C. Uncooked food          

    D. Cold tea

2. It is the best time to eat ice cream _____ .

    A. if your body is too hot from playing

    B. right after dinner

    C. after you've cooled down a bit after sports

    D. while playing football

3. From the text we can know that _____ can kill bacteria.

    A. ginger                    

    B. vinegar                  

    C. gram                        

    D. oranges

4. The text mainly tells us _____ in summer.

    A. what we can eat                                        

    B. what to eat and how to eat them

    C. how to cook food                                      

    D. how to stop food going bad

下列地理现象与其成因连接正确的是 

A．阴天时，天空仍然明亮—大气对太阳辐射的吸收作用

B．晚秋阴天的晚上没霜冻—大气逆辐射作用强

C．晚秋阴天的晚上没霜冻—大气辐射作用弱

D．青藏高原气温低—大气对太阳辐射的反射作用强

以下关于政策的说法中正确的是( )。

A．政策与法律都属于上层建筑的组成部分

B．政策也具有国家意志的属性

C．政策是明确、普遍的规范

D．政策一般比法律更稳定

患者，男，55岁。胸痛反复发作3年，现胸部刺痛，痛无定时，夜间尤甚，持续3分钟左右，病处固定，情绪波动后加重，时有心悸，舌质紫黯，脉象沉涩，心电图见ST段水平下降≥0.05mV，T波低平。

其最可能的诊断是（）

A.肺癌

B.支气管扩张

C.心肌梗死

D.不稳定型心绞痛

E.肺结核

肠阿米巴病最常发生的部位是

A．降结肠

B．乙状结肠和直肠

C．升结肠和横结肠

D．升结肠和盲肠

E．乙状结肠