For  _______information about present national boundaries, we’d better refer to an up-to-date map.
A．practicalB．frequentC．reliableD．beneficial
C
考查形容詞辨析。Practical實用的，frequent頻繁的，reliable可靠的，beneficial獲益的，句意：關(guān)于目前國家邊界的可靠信息，我們最好查閱一下最新式的地圖。故選C。
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