If the traffic is good, I can make it to the school to ______ the child.
A:pick
B:gather
C:collect
D:take
有两台自动包装机甲与乙,包装质量分别为随机变量X1,X2,已知E(X1)=E(X2),D(X1)>D(X2),则自动包装机____的质量好.