He seemed quiet calm and __________ by the news A: undisturbed B: disturb

____ undisturbed, the southern tip of Florida would be tropical evergreen forest and swamp.

Establishment of a ______ insurance system is essential for economic reforms. A: accurate B: sound C: undisturbed D: safe

The word "insignificant" in line 16 is closest in meaning to（） A: unimportant B: undisturbed C: immature D: inappropriate

If you have a forest that remains undisturbed, and another forest that has been logged. Which forest will show exponential growth?

The scientist's work was based on _______. A: occasional observations B: systematic observations C: observations of several nests D: observations of undisturbed nests

The scientist's work was based on______. A: occasional observations B: systematic observations C: observations of several nests D: observations of an undisturbed nest

____ undisturbed, the southern tip of Florida would be tropical evergreen forest and swamp. A: It were left B: It would be left C: Had it been left D: Were it left