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【单选题】
What is the main idea of this passage?
A.
Obesity is now a global problem that needs tackling.
B.
The weights increase fast throughout the whole world.
C.
Obesity and starvation are two main problems in the poor world.
D.
Obesity has shifted front the rich world to the poor world.
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参考解析：
刷刷题刷刷变学霸
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【单选题】甲、乙、丙三辆车的时速分别为60公里、50公里和40公里，甲从A地、乙和丙从B地同时出发相向而行，途中甲遇到乙后15分钟又遇到丙，问A、B两地相距多少公里？
A.
150公里
B.
250公里
C.
275公里
D.
325公里
【单选题】What do Democratic and Republican Senators think of President Bush's decision to send troops to Iraq?
A.
They both support it.
B.
They both oppose it.
C.
They both remain neutral to it.
D.
They have different views towards it.
【单选题】假设用12个二进制位表示数据。它能表示的最大无符号整数为(8)；若采用原码，它能表示的最小负整数为(9)。
A.
2047
B.
2048
C.
4095
D.
4096
【单选题】某2年期债券。每年付息一次，到期还本，面值为100元，票面利率为10%，市场利率为10%，则该债券的麦考利久期为( )年。
A.
1
B.
1.5
C.
1.91
D.
2