早春播种后，农民常用“地膜覆盖法”来提早出苗，其主要作用是[ ]
A．提高地温
B．防止雨淋
C．防止虫害
D．防止风沙
A
—Who will win（赢）the race（比赛）？
—It’s hard to say. Tony often runs Jim.
A．faster than
B．more slowly than
C．not so fast as
D．as fast as
X线平片上，4岁以后颅缝增宽的标准是
A．＞2mm
B．＞1mm
C．＞4mm
D．＞5mm
E．＞3mm
