下列中表示在一个食物链中消费者和生产者的比例,每个图的最下一层表示生产者,哪一个图表示这个食物链:草→粘虫→山雀→鹰 [ ]
A.
B.
C.
D.
答案:C
选择方框中的词填空。
1. (see / look)
Let's go and at the toy plane.
Can't you my football is here?
2. (have / has)
Mr and Mrs Read a son and a daughter.
My friend some new skirts.
3. (little / small)
This coat is too , where is the big one?
I have a cat, she's only one.
4. (Excuse me / Sorry)
, I can't show it to you.
, can you show it to me?
反射声通常是由于室内墙壁形成的,其幅度要受房间界面的吸声材料______的影响。