四六级考试

【单选题】
A、Because nothing in the world can be taken for granteD、

B、Because one always needs hard lessons before he becomes ma- ture.
C．Because each young generation is curious about everything.
D．Because the young generation must learn lessons to know drugs.

网考网参考答案：D
网考网解析：
[听力原文] Why shouldn’t we take a consistent drop in drug usage for granted document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>