第21题: [单项选择](I didn't mind) their coming (late) to the lecture, but I (objected) their making (so much noise). A. I didn’t mind B. late C. objected D. so much noise 参考答案:C 答案解析:动词用法错误,应改为objected to,因为object表“反对”时是不及物动词。object to sth./doing sth.反对某事(做某事)。
第30题: [单项选择]Which of the following is the function that nanoscale motors perform A. rearranging individual atoms B. manipulating individual atoms C. producing products and process D. photosynthesis and muscle concentration 参考答案:C 答案解析:第5段中讲"Living cells contain all sorts of nanoscale motors...from muscle contraction to photosynthesis