Experiments related to the sense of smell are more easily 　　　 than those related to perception of color.?

A.setting them up　 B.to set up ?

C.set up　　　　　　 D.set up those

A new virus related to SARS is reported______ at least one person in China last week.

A. to kill        B. to be killing       C. to have killed      D. kill

A new virus related to SARS is reported______ at least one person in China last week.

A. to kill        B. to be killing       C. to have killed      D. kill

_____ how plants were related was a complex and strange thing before Linnaeus developed his system.

1. A.
   To having shown
2. B.
   Shown
3. C.
   Show
4. D.
   Showing