药材狗脊的原植物科名是（） A.鳞毛蕨科 B.蚌壳蕨科 C.蓼科 D.毛

阅读理解天地。          

       爸爸的微笑消失了，脸色变得严肃起来。他想了一会儿，对儿子和小女儿说：“白杨树从来就这么直。哪儿需要它，它就在哪儿很快地生根发芽，长出粗壮的枝干。不管遇到风沙还是雨雪，不管遇到干旱还是洪水，它总是那么直，那么坚强， 不软弱，也不动摇。”     

       爸爸只是向孩子们介绍白杨树吗？不是的，他也在表白着自己的心。而这，孩子们现在还不能理解。 

1．用“      ”画出短文中的排比句，用“-----”画出短文中的设问句。 

2．“他也在表白着自己的心”这句话的意思是                                                               。 

3．用下列关联词造句。  

     (1)哪儿……哪儿……                                                                                                    

     (2)不管……总是……                                                                                              

4．这篇课文表面上写                              ，实际是写                            。这是一种                                       的写法。

Although spinach is rich in calcium, it also contains large amounts of oxalic acid, a substance that greatly impedes calcium absorption by the body. Therefore, other calcium-containing foods must be eaten either instead of or in addition to spinach if a person is to be sure of getting enough calcium. Which of the following, if true, most seriously weakens the argument above

A．Rice, which does not contain calcium, counteracts the effects of oxalic acid on calcium absorption.

B．Dairy products, which contain even more calcium than spinach does, are often eaten by people who eat spinach on a regular basis.

C．Neither the calcium nor the oxalic acid in spinach is destroyed when spinach is cooked.

D．Many leafy green vegetables other than spinach that are rich in calcium also contain high concentrations of oxalic acid.

E．(E) Oxalic acid has little effect on the body’s ability to absorb nutrients other than calcium.

为一位出生28天的患儿开具处方，处方前记年龄项应当填写

A．日龄
B．月龄
C．年龄
D．出生年月
E．身高与体重

简述在定义科学概念时必须遵守的一般原则。

苗木的起苗方法有（）、（）。