45.（ ）

(单选题)31.（ ） (单选题)Do you know any other foreign language ______ English? (单选题)We’d visited the village without advance notice and selected (单选题)I ______ you were here. (单选题)Stop making so much noise ______ the neighbor will start com (单选题)It is generally accepted that ______ boy must learn to stand (单选题)In the author’s view, the new vaccine production method seem (单选题)Which of the following is true according to the passage? (单选题)The foremost reason why the egg-based method is defective li (单选题)What step is essential to the traditional production of flu