某糌粑加工厂计划五年内产出8.4万袋糌粑，前3个月产出4500袋．照这样计算，该

阅读短文，从方框中选择适当的单词填空（每词限用一次）。

Do you like elephants? Elephants are 小题1:__________________ animals. They can play soccer or music. They can 小题2:_______________ draw very well. People say that “an elephant never forgets”. Elephant can walk小题3: _______________ a long time and never get lost. They can also remember places with小题4:_______________ and water. This helps them to live. But elephants are in great dangerous. People cut down trees so elephants are losing their homes. People also kill elephants for their ivory.

Today there are only about 3,000 elephants (over100,000 before) We must save the trees and not buy things小题5:. _______________ of ivory(象牙).

生态系统中能量流动和转化要遵循一定的定律，不属于这些定律的是 ( )

A．热力学第一定律

B．热力学第二定律

C．能量守恒定律

D．能量传递定律

对比

弃平台警报是（）

A、六长一短

B、七短一长

C、一长两短

D、三长两短