MG2×375-W采煤机适应煤质（）。
A。软中硬
B。中硬
C。硬
D。中硬较硬
参考答案：D
— Her father is very rich．
—________ She wouldn’t accept his help even if it were offered．
A．What for?
B．No wonder．
C．No doubt．
D．So what?
温室内种植蔬菜，为了提高产量，除了施肥，浇水外，还应采取的措施是：[ ]
A．增加空气湿度
B．降低空气湿度
C．增加氧气的浓度
D．增加二氧化碳的浓度
