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【多选题】
下列说法不正确的是（ ）A.
原子的质量几乎都集中在原子核上
B.
原子通过得失电子变成离子，但离子不能变成原子
C.
分子是保持物质化学性质的最小微粒
D.
原子是化学变化中的最小微粒
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举一反三
【单选题】Listen to the dialog and choose the best answer to each of the following questions. Which of the following statements about Xin is true?
A.
Xin cooked a lot in China though she didn ’ t need to.
B.
Xin cooks a lot in America though she may not enjoy cooking.
C.
X in likes pizza though she doesn ’ t like many other American foods.
D.
Xin often cooks in America because she misses Chinese food a lot.
【简答题】流行性腮腺炎的潜伏期为（）天。
【单选题】In China, for a professor called Liu Xin, the inappropriate form of address is ______.
A.
Mr. Liu
B.
Professor Liu
C.
Professor Xin
D.
Comrade Liu
【单选题】Who is the true benevolent in the story of Han Xin?
A.
Han Xin.
B.
The old lady who offered food to Han Xin.
C.
The local official.
D.
The man who bullied Han Xin.
【简答题】可由试验直接测定的土的物理性质指标有:( )、密度、( )。
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