语法问题，想的头都大了

mengyulan

as也可以conj

greenpuma

1, and Conj; also Adv

2, can steel and steel can

3, favor Verb.

DanielDuan

The astronomical unit is the average distance of the Earth from the Sun_______is the standard of distance in the Solar System.
(a) and
(b) also
(c) in addition
(d) because
答案是(a)，觉得also也可以啊，为什么不能选(b)呢？

Pure iron cannot be hardened by heating and cooling,as_____,because iron lacks the necessary cabon.
(a) steel it can
(b) can steel
(c) with steel can
(d) so can steel
这题不是很理解，觉得空格出应该是"steel can"，但答案是(b)，这难道是倒装吗？？？谁能给出完整的句子啊！

To (those) who (favorite) free trade,the revival of barter can suggest (nothing) less than a (disastr).
答案是(favorite)，我觉得who指代的是those，那么favorite是对的啊！怎么是错的呢？难道改成favorites

希望大家帮我指点指点……