|
Jack | I live in Beijing, China. It's 6 p.m. now. Dad is watching a basket-ball game on TV. I'm doing my homework. Mum is making dinner in the kitchen. My little sister is playing the piano. |
| Becky | I live in Sydney. Australia. It's 11 a.m. now. We are having a good time. Mum is talking on the phone to my grandmother. Dad is reading a newspaper. I'm watching a video about our school trip. Look! Our classmates are on the beach(海滩).Some are lying(躺)on the beach. Some are running around. I'm taking photos. |
| Sam | I live in New York, the United States. It's 7 a.m. now. My brother is making his bed. I'm washing my faces. My parents are making breakfast. I can see hot dogs and milk on the table. |
以上各反应中属于化合反应的是,属于分解反应的是,既是化合反应又是氧化反应的是。

①通过学习《消息二则》,使我明白消息可以分为五部分,即标题、导语、主体、背景、结语。导语是新闻开头的第一段或第一句话,它扼要地揭示新闻的核心内容;②主体是新闻的躯干,它用充足的事实表现主题,是对导语内容的进一步舒展和阐释。背景和结语有时暗含在主体中。


的离心率是( )
B .
C .
D .
中,
平面BCD,
,且
,M为AD的中点,则异面直线BM与CD夹角的余弦值为( )
B .
C .
D .
小海和小梅一起做“探究并联电路中电流的规律”实验.
位置 | A | B | C |
电 流/A | 0.30 | 0.24 | 0.54 |

材料一:下图为我国某时期的工业建设成就分布示意图。

材料二:如下表。
|
经济形态 |
1952年 |
1956年 |
|
全民所有制经济 |
19.1% |
32.2% |
|
集体所有制经济 |
1.5% |
53.4% |
|
公私合营经济 |
0.7% |
7.3% |
|
个体经济 |
71.8% |
7.1% |
|
私营资本主义经济 |
6.9% |
0 |
材料三:《共和国重大事件纪实——艰难探索》一文指出:“以钢为纲的‘大跃进’造成国民经济比例严重失调,其中重工业畸形发展,从1957—1960年产值增长2.3倍,而农业产值下降22.8%……到1960年,粮棉的产量跌落到1951年的水平。”