【简答题】阅读理解。 There are all kinds of trains in the world. There are trains to carry people, trains to carry animals or carry things. There are fast trains and slow ones. Some trains go through hills. In big c...
【简答题】What is the main idea of the passage? A) It is unwise to place the results of scientific research in the hands of a powerful mad man. B) The more knowledge one has, the wiser one becomes. C) Any incre...
【单选题】What produces a waterproof super glue, acts like a vacuum cleaner, and even teaches scientists about gene repair? The humble little shellfish known as the mussel (贻贝)。 Mussels are found worldwide. Som...
A.
seal itself from being damaged by sea water
B.
protect itself from being the food of other animals
C.
protect itself from being blown away by strong wind