根据下列文章回答 21~25 题:
第 21 题 Details of the private life of an astronaut are hard to come by,because they are__________.
根据下列文章回答 21~25 题:
第 21 题 Researchers in behavioral psychology are divided with regard to__________.
Questions 19 to 21 are based on the passage you have just heard.
第19题:
根据下列文章回答 21~25 题:
第 21 题 The best title of this passage could be__________.
根据下列选项回答 21~30 题:
第 21 题 is the headquarter of the Supreme Court?__________