挡土墙后的填土应该密实些好，还是松散些好，为什么？（  ）
A、填土应该松散些好，因为松土的重度小，土压力就小
B、填土应该密实些好，因为Φ大，土压力就小
C、填土的密实度与土压力大小无关
D、无法确定

单项选择题What's the purpose of this report?A.Reminding the English of the racial discrimination issues.B.Urging the government to implement regulations to protect the Muslims' rights.C.Calling for actions of the Muslims to protect their own rights.D.Stating the deprivations of Muslims.

不定项选择环境制约着行为，行为也会导致环境的改变。