A plant makes its own food in its leaves . Water comes to the leaves through the roots . Air gets into the leaves through very small holes . The green coloring in the leaves uses the water and air to make the food for the plant . It also needs sunshine because a plant can make food only when the sun is shining.
   Animals and people could not live without green plants . They both eat plants . People and some animals also eat the meat of some animals and these animals eat plant

动脉中流动的是动脉血，静脉中流动的是静脉血．（判断对错）

它并不是苏美任何一个国家的附庸或走卒，但却又是苏美两国都想拉拢又都曾与之对抗的国家，至少在冷战中它根本没有“称霸”的意图，最终它似乎没有站到苏美任何一边。材料中“它”（   ）

无脊椎动物是一个大家族，下列几种动物分别属于无脊椎动物中的哪一类群？将它们填在一起，并将它们的主要特征补充完整．

水螅____      a软体动物：身体柔软，外面有____。

蚯蚓____      b腔肠动物：身体辐射对称，有口无____。

河蚌____      c节肢动物：体表有外骨骼，身体分部，足和触角____。

蝗虫____      d环节动物：身体由许多相似的____构成。