被誉为我国石雕之乡的是( )。A．浙江永嘉 B．浙江青田 C．浙江富阳 D．浙江湖

读短文，判断正(T)误(F)。

     Long ago there were many animals on the earth. But now we can't see some of the animals, because

they died, such as(例如) dinosaurs. Some animals died of natural disasters(死于天灾). But some died

because man did bad things to the nature(自然界). People cut trees and built tall buildings. So some

animals had no food to cat, no homes to live in or clean water to drink. Man killed animals, too. Now

some animals are dying(死) out, such as pandas and antelopes(藏羚羊). If we don't want the animals to

disappear(消失) from the world, we should protect(保护)  the nature and animals.

( ) 1. Once there were many animals in the world.

(     ) 2. Some animals died, because the other animals killed them.

(     ) 3. Some animals died, because man did bad things to the nature.

(     ) 4. We are going to lose pandas if we don't protect them.

(     ) 5. Some animals are disappearing.

下列关于再生障碍危象的叙述错误的是

A．可出现某系或全系减少

B．骨髓涂片中可见巨大原始红细胞或巨大早幼粒细胞

C．骨髓多数增生低下

D．本病预后良好

E．有些药物可引起再障危象

直径为4cm的圆，周长是______cm，面积是______cm²．

A和B注册会计师在了解W公司的内部控制时，需要从不同的角度考虑与内部控制相关的风险。以下是A和B注册会计师根据W公司具体情况罗列的与内部控制风险相关的事项或情形，请分别针对下表所列的每种事项或情形，简要解释其对控制风险的影响。

下列关于栈的描述正确的是( )。

A．在栈中只能插入元素而不能删除元素

B．在栈中只能删除元素而不能插入元素

C．栈是特殊的线性表，只能在一端插入或删除元素

D．栈是特殊的线性表，只能在一端插入元素，而在另一端删除元素