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【单选题】
下列关于离子键的说法中正确的是 ( )
A.
离子键是由阴、阳离子通过静电作用达到平衡时形成的
B.
只有非金属化合时才能形成离子键
C.
凡是含有离子键的化合物一定含有金属元素
D.
含有离子键的化合物一定是离子化合物
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【简答题】Read the following words and match these words with their definitions. bully n. 仗势欺人者 conrtolling adj. 爱控制的 challenge n. 挑战 colleague n. 同事,同僚 forgive v. 原谅 flee v. 逃跑...
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A.
1
B.
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C.
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D.
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【单选题】Ford has got ____ milk.
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any
B.
some
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《幼幼新书》
B.
《婴童百问》
C.
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D.
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E.
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【单选题】All whales fall into two groups, those with teeth and those without. Both beluga and dolphin belong to the suborder of toothed whales known as Odontoceti, along with porpoises, narwhals, pilot whales,...
A.
Breeding habits of whales.
B.
Differences between whales.
C.
Efforts to preserve whales.
D.
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【简答题】Write down the proper words according to the meaning given below. 1) m_____ n. way of doing or achieving sth. 2) b_____ a. certain or very likely 3) e_____ v. make or become larger 4) o_____ n. ch...
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【简答题】Commence v. 开始start; come onto existence The ceremony will commence as soon as the minister arrives. 2. Glisten v. 闪烁 shine with a sparkling light Her eyes glistened with tears as she struggled to con...
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【单选题】Ford has got ____ milk.
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B.
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【单选题】提出烧灼断脐法预防初生儿脐风的著作是 ( )
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《幼幼新书》
B.
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C.
《全幼心鉴》
D.
《保婴撮要》
E.
《小儿卫生总微论方》
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【单选题】All whales fall into two groups, those with teeth and those without. Both beluga and dolphin belong to the suborder of toothed whales known as Odontoceti, along with porpoises, narwhals, pilot whales,...
A.
Breeding habits of whales.
B.
Differences between whales.
C.
Efforts to preserve whales.
D.
The intelligence of whales.
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