如果班级要举行登山活动，最好事先查找相关的 A．等高线地形图 B．导游图 C．政

A plant(植物) makes its own food in its leaves .Water comes to the leaves through the roots（根）. Air gets into the leaves through very small holes（孔） . 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 plants.

小题1: A plant gets food from________

A．the sun

B．its leaves

C．its roots

D．the air小题2:What does the green coloring use to make the food for a plant?

A．Sunshine ,water ,air and the roots

B．Air ,sunshine and water

C．Water ,air and meat

D．Water ,sunshine and animals小题3:A plant has very small holes in its leaves for__________ to come in.

A．air

B．water

C．sunshine

D．green coloring小题4: A plant can make its food when it is _______.

A．cloudy

B．rainy

C．sunny

D．windy小题5:People would die without________

A．animals

B．meat

C．plants

D．leaves

对于经营性项目，一般在项目投产运营( )年后进行后评价。

A．1～2

B．3～5

C．5～7

D．8～10

科学家通过宇宙探测仪发现金星大气层中含有物质X。X可以通过下列反应制取：

CH₂(COOH)₂X+2H₂O，则物质X的化学式为(      )。

A．CO

B．CO₂

C．C₃O₂

D．C₂O₃

裸露爆破法与其它工程爆破法的区别？

根据左传，是谁在晋厉公面前诬陷了三郤，导致郤氏被族灭？