2. 外语
  3. Desert trees such as the giant cactus guard ______internal moisture with sharp spikes.

Desert trees such as the giant cactus guard ______internal moisture with sharp spikes.

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问题 Desert trees such as the giant cactus guard ______internal moisture with sharp spikes.
选项 A、their
B、theirs
C、they
D、these
答案A
解析 Their agrees with its referent, desert trees.
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