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问题 单项选择题

成熟菌斑的基本结构分为

A．获得性膜和唾液
B．基底层、中间层和表层
C．上皮细胞和羟基磷灰石
D．多糖和矿物质
E．唾液蛋白、细菌和矿物质

答案

参考答案：B

选择题

Mary often does some translation work to earn extra money, which______half of her income.

(潍坊市)

A．makes for

B．counts on

C．accounts for

D．consists in
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单项选择题

Questions 24-30


·Look at the questions for this part.
·You will hear a passage about "Odds and Ends ".
·For questions 24-30, indicate which of the alterative A, B, or C is the most appropriate response.
·Mark one letter A, B or C on the Answer Sheet.

Thomas Edison provided valuable wealth for the modern world because ______.

A．he never let any time slip by

B．he always thought and planned

C．he always tapped out messages without stopping
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