推理是一种重要的学习方法。下列推理中正确的是( )
A:物质与氧气发生的反应都是氧化反应,则氧化反应一定要有氧气参加
B:单质是由一种元素组成的物质,则由一种元素组成的物质一定是单质
C:分子、原子都是不带电的微粒,但不带电的微粒不一定都是分子、原子
D:二氧化碳气体能使燃着的小木条火焰熄灭,则能使火焰熄灭的气体一定是二氧化碳
读东南亚地区示意图,回答下列问题。
阅读下面的文言文,完成问题。
与朱元思书
吴均
风烟俱净,天山共色。从流飘荡,任意东西。自富阳至桐庐一百许里,奇山异水,天下独绝。
水皆缥碧,千丈见底。游鱼细石,直视无碍。急湍甚箭,猛浪若奔。
夹岸高山,皆生寒树,负势竞上,互相轩邈,争高直指,千百成峰。泉水激石,泠泠作响;好鸟相鸣,嘤嘤成韵。蝉则千转不穷,猿则百叫无绝。鸢飞戾天者,望峰息心;经纶世务者,窥谷忘反。横柯上蔽,在昼犹昏;疏条交映,有时见日。
All people will ________sadness and happiness in life.
植物体内具有很强分裂能力的组织是( )
A: Hello, Mike.
B: Hello, Lucy.
A: ____
B: I'm feeling better now.
B: He said I had got a bad cold.
B: No, I can't. I have to stay in bed for a few days.
B: Could you help me with my lessons when I am well?
A: Sure. ____
B: Thank you.
A. What's wrong with you?
B. I hope you'll be better soon.
C. Can you come to school today?
D. How are you today?
E. I'm sorry to hear that.
F. What did the doctor say?
G. Are you feeling better now?