Ina chemical plant, a variety of slurries, or sticky substances,are transferred from place to place. Standard valves would have a difficult timewith this type of product, but are specificallydesigned for the job.
【单选题】Directions: Read the following passage carefully. The passage is followed by some questions or unfinished sentences. For each of them there are four choices marked A, B, C, and D. Choose the best an...
A.
Grammar is something you cannot escape from.
B.
Grammar is a kind of that requires a lot of practice.
C.
Grammar is a set of rules that are used in a language.