题目内容
（请给出正确答案）
[主观题]
Living in the central American desert has its problems， __________obtaining water is not t
he least.
A.of which
B.for what
C.as
D.whose
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A．拟胆碱药、抗胆碱酯酶药、抗胆碱药、抗肾上腺素药
B．拟胆碱药、拟肾上腺素药、抗胆碱药、抗肾上腺素药
C．拟胆碱药、抗胆碱药、拟肾上腺素药、局部麻醉药
D．拟胆碱药、抗胆碱药、拟肾上腺素药、刺激药
