单项选择题

Conversation one When will he attend the performance

A．On Sunday, May 21.
B．On Monday, May 22.
C．On Thursday, May 25
D．On Sunday, May 26
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单项选择题
How does the man identify a disease gene
A．He uses a special instrument.
B．He analyses the gene carefully.
C．He bases his finding on his previous research.
D．He sends the results of his analysis to biologists for confirmation.
单项选择题
Animals are one of the most important resources for human beings, however , by 2030 ,many species will have ______ according to recent research .
A．used up
B．died out
C．gone up
D．got rid of
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