A. spreading B. extending C. squeezing D. stretching 参考答案:D 答案解析:stretch在此意为“把……拉直,将……拉长”,如:The rope must be stretched tight必须把绳子拉紧。spread通常指“把……铺开,展开,传播,散布(消息、疾病、影响
第20题: [单项选择]He set out ______ the theory in simple words. A. explain B. to explain C. explaining D. explained 参考答案:B 答案解析:短语set out to do something意为“着手做某事”。如用set about则后接动名词doing的形式。