[单项选择]Electrical appliance such as toasters or hair dryers are designed to ______the ability of an electric current to heat a wire.
A. take the risk of B. take advantage of C. take responsibility of D. make sense of
参考答案:B 答案解析:词组辨析题。take the risk of意为“冒险做某事”;take advantage of表示“利用”;take responsibility of表示“为某事负责任”;make sense
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第1题: [单项选择]吗啡禁用于分娩止痛及哺乳妇女的原因是() A. 促进组胺释放 B. 激动蓝斑核的阿片受体 C. 抑制呼吸,对抗催产素作用 D. 抑制去甲肾上腺素神经元活动 E. 以上都不是 参考答案:C 答案解析:吗啡可通过胎盘和乳汁抑制胎儿或新生儿呼吸,同时能对抗催产素对子宫的兴奋作用而使产程延长,故禁用于分娩止痛和哺乳期妇女止痛。