妊娠合并症中孕产妇死亡率最高的是
A．心脏病B．肝炎C．糖尿病D．甲状腺功能亢进症E．肺结核
参考答案：A
一物体从距离地面高为h的位置开始做自由落体运动,g=10m/s2,物体在落地前的1秒时间内下落35m;求:
（1）物体从开始到落至地面所用的时间t；
（2）物体距离地面的高度h。
At the good new __ ___.
A．up he jumped from his chair
B．up jumped he from his chair
C．from his chair did he jump up
D．up from his chair did he jump
