题目:
The Thinker, head in hand, resting his right arm on his left knee, gained its current title when ______ in Paris in 1890.
A.exhibiting
B.exhibited
C.was exhibited
D.being exhibited
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:用显微镜观察细胞的结构时,必须使光线能够依次通过反光镜、光圈、通光孔、物镜、镜筒、目镜.所以所选用的材料必须是薄而透明的,为的是让光线能够通过.光线透过物体的结构进入人的眼睛,能够...