【简答题】________ is known to the world, Mark Twain is great American writer. A) That B) Which C) As D) It
【单选题】Mark Twain is well known for his ______.
【单选题】( ) is known to the world, Mark Twain is a great American writer.
【判断题】各种微生物包括呈丝状生长的放线菌和霉菌在内,都会出现一条呈四个生长期的典型生长曲线。