单项选择题

Without sufficient information, it can be very difficult to decide ______ a particular marketing program is profitable to your business or not.

(A) how
(B) that
(C) whether
(D) where
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单项选择题
An increase in global temperatures could cause many changes, among ______ the amount and pattern of precipitation resulting in floods and drought.
(A) that
(B) this
(C) them
(D) which
单项选择题
Unless we can be ______ for an event like this and change our strategies, the company will still be in the red for the foreseeable future.
(A) prepare
(B) prepared
(C) preparatory
(D) preparation
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