根据税收征收管理法律制度的规定，纳税人超过应纳税额缴纳的税款，可以在结算缴纳税款之口

图中小河的流向是（　　）

A．由南向北流

B．由东向西流

C．由北向南流

D．由西向东流

We are going to take the College Entrance Exams in about sixteen days. Therefore, many students still don’t know what to balance their study, rest and physical exercises while prepared for the Exams. They usually devote too much time to go over their lessons, what results in a poor health and low efficiency of learning.

As the proverb goes, early to bed and early to rise make a man healthy, wealthy and wise. We’d better leave us enough time to rest and sleep since it enables us to learn our lessons more efficient. What’s more, a strong and healthy body is the base for our further study, future work and creative activities.

In brief, as we are preparing for the Exams, don’t forget that rest, exercise and study were equally important.

科学工作者将一株矮杆低产的小麦与一株高杆高产的小麦进行杂交，在后代植侏中，出现了矮杆低产、高杆高产、矮杆高产、高杆低产四种类型的小麦．请分析回答：

（1）人们应该选出其中哪种植株继续多代繁殖培育，从而得到有利于人类的新品种小麦？______．

（2）题中涉及到的小麦性状中，属于相对性状的有：______、______．

（3）杂交亲代中的矮杆低产和高杆高产性状在后代中依然出现，这种与亲代相似的现象叫做______，后代中出现了矮杆高产和高杆低产两种新类型，这种与亲代不同的现象叫做______．

若电梯井道壁为砖墙结构，不宜采用（）固定导轨支架。

A.膨胀螺栓

B.剔孔洞，混凝土灌注导轨支架

C.穿钉螺栓在井道壁内外侧固定钢板

D.将导轨支架焊接在钢板上