题目内容

为防止抹面砂浆开裂，可加入以下哪些材料？

A. 纸筋
B. 麻刀
C. 陶粒
D. 膨胀珍珠岩

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三名不同的运动A、B、C同时在同一条件下进行打靶比赛，各打10发子弹，他们打中的环数如下：A：8,7,9,10,9,6,5,8,10,5B：8,7,9,6,8,9,10,7,8,9C：10,10,9,6,8,3,5,6,7,4问这三名运动的稳定性是否一样(α=0.05)？

It was two years ago______his sister became a doctor.

A. that
B. where
C. who
D. What

Jack called the airline to ___________his flight to Beijing this morning.

A. improve
B. believe
C. insure
D. cancel

To work __________with the machine,you must read the instructions carefully.

A. firstly
B. naturally
C. efficiently
D. Generally