题目

Remy’s mother got sick before he was born. She could not 1 Remy. So he needed a foster mother to take care of him. A foster mother is a mother who takes someone else’s child into her 2 and cares for the child for a period of time just as what she would do to her own child. In our human society, when a child’s 3 meet their unfortunate（不幸的） deaths for a certain reason or reasons, or its parents become too4 to look after it, this child will have to find a foster family, especially when it is a baby or at a very young age. In the world of 5 in nature, the young may not be so lu在“研究斜面的倾斜程度与机械效率的关系”的实验时，小华用同一块木板先后搭成倾角不同的两个斜面．他用平行于斜面的力拉着同一个木块M，分别在两个斜面上匀速前进相同的距离．如图所示．通过观察和实验，小华得到一些结论．请你判断这些结论的正误．（正确的画“√”，错误的画“×”）（1）甲图中木块M上升的高度比较大．______（2）甲图中的斜面更省力．______（3）乙图中拉力F2做功比较多．______（4）乙图中斜面的机械效率比较低．______．