However, at times this balance of _____ nature is _____, resulting in a number of possibly ___ effects.

A．the; troubled; foreseen                                B．X; puzzled; unforeseen

C．X; mixed; foreseen                                     D．X; disturbed; foreseen

However, at times this balance in nature is ________ resulting in a number of  possibly unforeseen effects.

A. troubled          B. bothered        C mixed     D. disturbed

However, at times this balance in nature is ________ resulting in a number of  possibly unforeseen effects.

A. troubled           B. bothered         C mixed      D. disturbed

However, at times this balance in nature is ________ resulting in a number of  possibly unforeseen effects.
A. troubled          B. bothered        C mixed     D. disturbed

 However, at times this balance in nature is ________ resulting in a number of  possibly unforeseen effects.

A. troubled           B. bothered         C mixed      D. disturbed