【題目】19世紀末,物理學家瑞利在研究中發(fā)現,從空氣中分離得到的氮氣密度,與從含氮物質制得的氮氣密度有0.0064 kg/m3的差異,他沒有放過這一發(fā)現,在化學家拉姆塞的合作下,經過十幾年的努力,于1894年發(fā)現了空氣中的氬氣。下列說法正確的是________(填序號)。
①氬是一種化學性質極不活潑的氣體;
②瑞利從空氣中分離的氮氣是純凈物;
③19世紀末以前,人們認為空氣由氧氣和氮氣組成的;
④瑞利發(fā)現,從含氮物質制得的氮氣密度大于從空氣中分離的氮氣的密度。
科目:初中地理 來源: 題型:
【題目】B
Once there was a parrot on sale in a pet store. It was a beautiful red and blue bird. It sat on a perch in the middle of the store, so that everyone could see it when they came in. The owner was very proud of it and asked a high price for it.
One day a man went into the store. "That’s a beautiful bird," he said to the pet store owner, "But why is it so expensive? Is it an unusual bird?"
"No, it’s not very unusual. It’s expensive because it can talk," the pet store owner said.
"I see. How can I make it talk?" the man asked.
The pet store owner asked him,"Do you see those strings tied to each of the bird’s legs?"
"Yes,"the man answered.
"Well, you pull those strings," the pet store owner told him. "That will make the parrot talk."
The man asked, "Do you mind if I try?"
"Not at all," the pet store owner said.
The man walked up to the parrot and pulled the string on its left leg. The parrot said, "Good morning."
The man pulled the string on the parrot’s right leg. This time the parrot said, "How are you today?"
"That’s not very interesting, " said the man. "Any parrot could do that." Then he laughed, "But what would happen if I pulled both strings at the same time?"
"I’ll fall off my perch, youfool!" the parrot said.
【1】 The parrot was expensive because __________.
A. it was pretty beautiful B. it could talk with the people
C. it was a very unusual bird D. it was in the middle of the store
【2】The parrot would talk when __________.
A. people came into the pet store B. it was the pet store owner
C. people said it was beautiful D. people pulled the strings on its legs
【3】 Which is the first sentence that the parrot said to the man?
A. Good morning. B. How are you?
C. That’s wasn’t interesting. D. I’ll fall off my perch, you fool.
【4】 From the story we know the parrot was __________.
A. kind B. silly C. clever D. crazy
【5】The best title for the passage should be __________.
A. Unusual Parrot B. Parrot Talk C. Silly Man D. Clever Owner
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科目:初中地理 來源: 題型:
【題目】下面關于內能的說法中,正確的是( )
A. 一個物體沒有機械能,就沒有內能
B. 一個物體可以沒有內能,但一定有機械能。
C. 因為內能與溫度有關,所以0℃的物體沒有內能。
D. 一切物體都有內能
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【題目】
【1】watch, Tom, in, evening, the, doesn’t, TV
____________________________.
【2】favorite, what, is, your, sport
____________________________?
【3】because, art, like, I, it, interesting, is
_____________________________.
【4】he, have, does, on, Monday, geography
_____________________________?
【5】music , subject , favorite , is , his
_____________________________.
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科目:初中地理 來源: 題型:
【題目】
【1】a,v,e,h, _____
【2】e,t,n,n,s,i _______
【3】l,b,a,v,o,l,y,e, l,l________
【4】u,f,n ______
【5】o,u,s,n,d ______
【6】a,c,s,s,l _______
【7】a,e,l,t_____
【8】e,s,a,m_______
【9】i,w,h,t ________
【10】b,o,i,n,r,g_______
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科目:初中地理 來源: 題型:
【題目】用符合題目要求的序號填空:
①氧氣;②空氣;③二氧化碳;④二氧化硫;⑤五氧化二磷;⑥四氧化三鐵。
(1)通常狀況下無色、無味的氣體是________;
(2)有刺激性氣味并且污染空氣的氣體是________;
(3)屬于黑色固體的是________;
(4)支持燃燒的氣體是________;
(5)屬于白色固體的是________。
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科目:初中地理 來源: 題型:
【題目】下列有關氧氣性質的說法中錯誤的是( )。
A.氧氣是一種化學性質比較活潑的氣體
B.它能跟所有物質發(fā)生化學反應
C.在氧化反應中一般都有熱量放出
D.氧氣能供給呼吸,支持燃燒
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科目:初中地理 來源: 題型:
【題目】實驗測得某物質中只含有碳元素,則這種物質( )。
A.一定是金剛石或石墨中的一種
B.一定是木炭或活性炭中的一種
C.一定是碳元素的一種單質
D.可能是一種碳單質,也可能是幾種碳單質組成的混合物
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科目:初中地理 來源: 題型:
【題目】下列常見的鹽在生產、生活中的用途不合理的是( )。
A.用亞硝酸鈉腌制食品
B.碳酸鈉廣泛應用于玻璃、造紙、紡織和洗滌劑的生產
C.用純堿消耗面粉發(fā)酵生成的酸
D.天安門前的華表是用大理石做的,碳酸鈣還可用作補鈣劑
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