有人Longman书上的Complete test2吗

有2道好象不太对呢?

1.P448 关于航海的那一篇,第8题, the missing piece of the navigational puzzle.是为了说明什么?

B. highlight  that the ability to determine longtitude was the final problem to  be sovled

D. determine that it was difficult to calculate latitude.

这个........,怎么选D了呢??,第4段在说longtitude啊？

2.P458.39 (6) the era of films showing unusual acts这个明明是 transitional era的内容,怎么归到primitive era了呢??那时侯还没有演员啊,只是拍摄日常生活.

令我苦恼的无法入眠,哎~~~~~