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  3. At first, the new lightweight drill has been invented to A useful feature of the new drill for space mission is

At first, the new lightweight drill has been invented to A useful feature of the new drill for space mission is

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问题 At first, the new lightweight drill has been invented to
A useful feature of the new drill for space mission is
选项 A、its applicability.
B、its lightweight.
C、its multifunction.
D、its flexibility.
答案B
解析 事实细节题。文章第二段指出"彩色照片显示，这种新型钻孔机穿透了一块砂岩，而钻如此小以至于只需用它的电源线来支撑住它。在使用时，产生相对小的垂直重力是未来太空任务中一个有用的因素，那时需要将重量保持在最低点"。由此可以知道新型钻头在太空任务中一个有用的特征是其重量轻。
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