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【单选题】
「兄弟」的日语发音为（ ）。A.
きょだい
B.
きょうたい
C.
きょうだい
D.
ぎょうだい
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举一反三
【单选题】While sometimes it’s necessary to have phone calls in public, loud phone conversations are not so .
A.
believable
B.
acceptable
C.
considerable
D.
approachable
【简答题】已知正四棱锥的底面面积为4cm 2 ，体积为4cm 3 ，设它的侧面上的斜高与底面所成角的大小为θ，则sinθ的值是______．
【单选题】正四棱锥（底面正方形，顶点在底面的射影是底面的中心）的底面面积为Q，侧面积为S，则它的体积为（ ）
A.
1 3 Q S
B.
1 6 Q( S 2 - Q 2 )
C.
1 2 S( S 2 - Q 2 )
D.
1 2 Q( S 2 - Q 2 )
【简答题】It’s necessary for her to change her dress after a busy day. She needed __ her dress after a busy day.
【单选题】When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are .
A.
operational
B.
open
C.
closed securely
D.
at middle position
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