请教二道语法题, 0008, 36, 38. 谢谢

goodby

36. The nectar of flowers (are ingested) by worker bees and (converted) to honey in (special) sacs in (their)digestive systems.
A B C D
答案是D, 可我就是不明白,为什么? 不是be done by 吗?

每次一出现这类的题我范湖了.

又加了一道

38. The (sensation) of (sound) is produced (how) vibrations transmitted through the air (strike) the eardrum.

答案是D, 不明白为什么

谢谢了

[此贴子已经被作者于2005-7-5 8:24:25编辑过]

尘埃

36题答案应该是A吧？nectar是不可数名词，谓语动词怎么能用复数？

38题答案是C。The sensation of sound is produced 是完整的主句，应该把how改为when引导状语从句。

goodby

以下是引用尘埃在2005-7-5 12:34:00的发言：

36题答案应该是A吧？nectar是不可数名词，谓语动词怎么能用复数？

38题答案是C。The sensation of sound is produced 是完整的主句，应该把how改为when引导状语从句。

谢谢，都明白了。上面我给出的答案抄错了。