题目内容

Several heads of state were _____ attendance at the ceremony.

A. at
B. of
C. in
D. on

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Air is _______, but we can feel its motion when there is wind.

A. vision
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C. visibility
D. invisible

He chose to major in a foreign language in college due to his __________lack of interest in sciences.

A. apparent
B. apprehensive
C. aspiring
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A. 扎带宜从下往上穿,扎带上的刻齿朝内;
B. 扎带宜从下往上穿,扎带上的刻齿朝外;
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A. 制作后的羊眼圈直径比螺丝直径稍大;
B. 制作后的羊眼圈直径比螺丝直径稍小;
C. 制作后的羊眼圈直径比螺丝垫片外沿稍小;
D. 制作后的羊眼圈直径比螺丝垫片外沿稍大;