如图所示,从某高度水平抛出一小球,经过时间t到达地面时,速度与水平方向的夹角为θ,不计空气阻力,重力加速度为g.下列说法正确的是（    ）

    This is Mike's bedroom. You can see a desk and a bed in the room. On the desk, there is a backpack and three books. One is a Chinese book, the other two are English books. There is a clock on the desk, too. You can see a baseball under the desk. On the bed there is a box. Can you guess what's in the box? Ah, it's a new computer game. It's the present(礼物) for Mike's seventh birthday.

我国年降水量空间分布的总趋势是 （    ）