B
阅读下面的图表,做51~53小题。
Dolphins live in the water, but they’re not fish.
When they swim, they often jump out of the water.
Dolphins are very friendly to people. Would you like
to learn to the talk on Friday? Call Mr. Lu at
010-82214824.
根据汉语意思写单词。
我们通常说的“用钱生钱”,指的是( )
铝在生活生产中具有广泛的用途。
函数fx=log2x+2x-1的零点必落在( )