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问题
单项选择题
对变异型心绞痛最有效的药物是
A．硝酸甘油
B．硝酸异山梨酯
C．硝苯地平
D．普萘洛尔
E．噻吗洛尔
答案
参考答案：C
选择题
The population of Jiangsu _____ to more than twice what it was in 1949. The figure is now approaching 74 million.
A. has grown
B. have grown
C. grew
D. are growing
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单项选择题
凉菜间的温度不得高于（）℃。
A.20
B.25
C.30
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