## 语法题目 ##
In the Arctic area, ice fog may form under clear skies in winter, ____ coastal fogs or low stratus clouds are common in summer.
A. because of
## 题目解析 ##
答案解析：空格前后为两个完整的分句，由句意可知填转折连词。because of 不能接句子，despite 为介词，不接句子，that 不是转折连词。
先看句子，逗号前后是两个主谓结构完整的句子，故判断空格处应该填入一个连词，将两个句子连接起来。AC 两个选项为介词，后接名词性短语，但不能接句子，故排除。BD 两个选项为连词，可以接句子，根据句意，逗号前后两部分内容存在转折关系，故选择 B 选项。
## 知识点梳理 ##
常见介词：at, by, for, from, in, near, of, off, on, during, since, before, after, until, inside, out of, within, without, outside, throughout, as to, until after, except for, at the cost of, at the mercy of, by means of, in place of, by favor of, in spite of, in/with reference to, in/with regard with
① I have lived here <u>for a year</u>.
② I'll wait for you <u>till 10 o'clock</u>.
③ I <u>was familiar with</u> nobody <u>at the meeting</u>.
④ Swimming <u>is good for your health</u>.
⑤ We can see <u>with our eyes</u> and write <u>with our hands</u>.
⑥ We succeeded <u>by cooperating</u> <u>with them</u>.
⑦ She seems to know the solution <u>to the problem</u>.
常见从属连词：when, while, as, before, after, until, till, since, if, unless, so that, because, although 等
常见并列连词：and, or, but, yet, for, either…or, both…and, not only…but also, as well as, neither…nor 等
① <u>When he comes</u> I'll tell him about it.
② I wasn't long <u>before he told us about it</u>.
③ We <u>danced and danced</u> <u>until they all joined in</u>.
④ He was worried <u>because he hadn't had any letter from her</u>.
⑤ <u>Although everyone played well</u>, we lost the game.
⑥ We were <u>singing and dancing</u> all evening.
⑦ She has been learning English for six years, <u>but she doesn't speak it very well</u>.
⑧ The days were short, <u>for it was now December</u>.