根据短文内容填空

     The old man is already sixty years old. But he has only fifteen birthdays. How is it? When is his birthday?

     Keys: His birthday is on February 29th. It's a leap(闰年) year every four years. So he has only fifteen birthdays.

1. The old man is __________ years old.

2. He has only __________ birthdays.

3. His birthday is on __________.

4. A leap year happens(发生) every __________ years.

下列加点的成语使用正确的一项是（   ）                             （   ）

A．读图时代似乎把人们从皓首穷经的桎梏中解放了出来，殊不知又将人们搁置在随时可能会干涸的肤浅之海里。

B．饮水机行业在过快的发展中因监管乏力造成了饮水机市场鱼目混珠的局面，一些伪劣产品严重危害着人们的身体健康。

C．在中华人民共和国成立六十年的国庆阅兵式上，中国军方多款新型武器装备的展示，引发西方军事专家捕风捉影的各式猜测。

D．教学语言要做到严谨简洁，既不能模棱两可，也不要繁文缛节，应抓住重点，有的放矢，尽量在最短的时间内传达最大的信息。