题目

右图表示一分子                                   A．DNA                                                 B．脱氧核苷酸 C．核糖核苷酸                                          D．氨基酸 答案：BHe is a boy of ________ words. He doesn't speak until ________. [　　] A．a few; spoken toB．few; speaking to C．a few; speaking toD．few; spoken to