For Questions 16 through 20, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

The problem with activists is that far too often they merely the protection of various ecosystems, instead of taking a lead role in their management.（）

A．The model for the Mona Lisa was a very happy and kind woman.
B．The Mona Lisa is one of the most well known portraits in the world.
C．Leonardo da Vinci’s paintings all contained some kind of mystery in them.
D．The painting was apparently supposed to be a present to the Duchess of Milan.
E．Lisa Gherardini must have been a very patient person to sit for such a detailed portrait.

A. artificial
B. geriatric
C. mortal
D. articulate
E. discard
F. replace
G. stabilized
H. transferred
I. filched