How many strokes may be reduced in a year if most of stroke patients can be treated in the way as the article recommends？
A. 5, 000, 000.
B. 500, 000.
C. 50, 000, 000.
D. 15, 000, 000.
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What happened in
A. The restaurants began to serve smaller portions.
B. Health experts advised people to eat less.
C. Many Americans tried to get slim.
D. The American waistline started to expand.
Taking two blood pressure-lowering drugs may produce__________less risk of secondary strokes than taking only one such drug.
A. three quarters
B. nearly tour tenths
C. one fifth
D. about one fourteenth
水泥搅拌法用于处理泥炭土、有机质土、塑性指数大于（）的黏土、地下水具有腐蚀性时以及无工程经验的地区，必须通过现场试验确定其适用性。
A. 15
B. 25
C. 30
D. 35
下列不属于特殊电雷管的是（）。
A. 无起爆药电雷管
B. 毫秒延期电雷管
C. 安全电雷管
D. 抗杂散电流电雷管
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