15．For our high school students，some courses are compulsory，while others are    ．（　�。�
A．complicatedB．diverseC．controversialD．optional

分析 對于我們高中生來說，一些課程是必修課，另一些則是選修．

解答 答案D．考查形容詞辨析．complicated表示""復(fù)雜的，diverse表示"多樣的，多樣性的"，controversial表示"有爭議的，有爭論的"，optional表示"可選擇的，隨意的"．根據(jù)句意，對應(yīng)compulsory"必修的"為D optional．

點評 考查形容詞詞意辨析的題，熟記單詞的意思，根據(jù)句意進(jìn)行確定．

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