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【简答题】
（3分）有些汽车安装了安全气囊，气囊中装有“叠氮化钠”(NaN 3 )等固体粉末。一旦汽车发生强烈的意外碰撞，传感器将激活特定的电路放电，叠氮化钠迅速分解生成钠并放出氮气(N 2 )，使安全气囊打开，起到保护作用。此后气体通过气囊上的小孔迅速消散，气囊收缩。 (1)写出叠氮化钠在放电条件下分解的化学方程式： 。 (2)写出安全气囊中选用叠氮化钠的理由： 。
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【简答题】Make sure 确保
【单选题】Jenny pushed the door again to ______ it ______.
A.
make sure if; was closed
B.
make sure that; was locked
C.
found out it; was shut
D.
find out that; was open
【单选题】Why did Chanel test her clothes on moving models? a She wanted to make sure they looked good. b She wanted to make sure that models could move around easily. c She wanted to make sure the material was...
A.
a She wanted to make sure they looked good.
B.
b She wanted to make sure that models could move around easily.
C.
c She wanted to make sure the material was strong enough.
【简答题】已知，则的值为 ．已知 ，则 的值为____．
【简答题】已知 ，则 的大小为（ ）；已知 ，则 的大小为（ ）
【单选题】They surveyed the area __ the tomb faced south.
A.
make sure
B.
making sure
C.
to make sure
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