People cut down many trees, __________ many animals are losing their homes.
A:so
B:because
C:for
D:or
次 数
1
2
3
4
加入稀硫酸质量/g
50
剩余固体质量/g
8.5
7
6.6
如图是模拟膈肌运动的实验装置.请回答:
By mentioning Muhammad Ali's words, the author intends to tell us that.
根据实验目的和实验原理选择恰当的实验材料、用具,是保证实验获得可靠结果的关键因素之一,下列实验选用的材料,用具合适的是( )