7. Built on the banks of the Mississippi River, it is often so humid in the city of Memphis during the summer that the air feels like steam.

　　(A) it is often so humid in the city of Memphis during the summer that the air feels like steam

　　(B) the city of Memphis is often so humid during the summer that the air feels like steam

　　(C) the city of Memphis, which is often so humid that the air feels like steam during the summer

　　(D) during the summer the city of Memphis is often so humid to where the air feels like steam

　　(E) summer in the city of Memphis is often so humid that the air feels like steam

　　答案：B

　　类型：逻辑主语

　　解析：built on the banks…做状语，built逻辑主语必然是句子主语，那么句子主语应该是某种建筑，因此可以直接排除AE。B正确。C只有which引导的从句，没有主句。D中to where使用错误。

　　8. Dinosaurs captured the public’s attention in the nineteenth century, and the scientists which found and will study dinosaur fossils were highly esteemed.

　　(A) and the scientists which found and will study

　　(B) and the scientists who found and studied

　　(C) the scientists who found and studied

　　(D) the scientists finding and studying

　　(E) also the scientists which found and studied

　　答案：B

　　类型：定语从句和句子结构

　　解析：原句中which使用肯定错误，which不能指人，因此E选项也肯定错。C和D都是run-on句，错。只有B正确。