金属在一定温度和应力作用下，逐渐产生弹性变形的现象，就是蠕变。

The guide’s last words_________us that we should bring raincoats or umbrellas.

A．recommended

B．remembered

C．replied

D．reminded

某企业预计年现金需要量1000000元，已知有价证券的报酬率为9%，将有价证券转换为现金的转换成本为50元，则最佳现金持有量为( )元。

A．100000

B．33333

C．25000

D．43000

Here ______ my family tree, and there are six people in my family. [ ]

A. is

B. am

C. are

It was 1504,and Columbus was making another trip to the New World. Columbus and his men needed fresh water and food after three months at sea. They saw an island and went on shore. On the island there were unfriendly Indians who refused to give food to them. Columbus’ men were afraid of the Indians, but he had a clever plan. He used sign language to tell the Indians about his mysterious (神秘的) power to turn off the light in the sky. He knew about a lunar eclipse (月蚀) the next night because the information was in his almanac (天文历书). Columbus told the Indians, “ Tomorrow night I’ll turn off the light in the sky.” But they didn’t believe him . When the eclipse began the next night ,the Indians became very frightened . They begged Columbus to turn on the light again , and they quickly gave him all the food and water he wanted. Immediately Columbus and his men hurried back to the ship and sailed away in the moonless night.

小题1:Columbus and his men stopped at the island because_______________.

A．they wanted to meet the Indians there

B．they hoped to get supplies of food and water

C．they had never been on the island before

D．they had planned to visit it小题2:The Indians ___________ Columbus and his men.

A．were glad to see

B．were kind to

C．welcomed

D．were not kind to小题3:Columbus ________ to tell the Indians that he had mysterious power.

A．used movements of hands and expressions in his face

B．spoke in the language of the Indians

C．drew a lot of signs

D．wrote in the language of the Indians小题4:“The light in the sky ” here means __________.

A．the sun

B．the moon

C．the stars

D．the daylight小题5:The Indians gave Columbus food and water because they _________.

A．believed Columbus was a man with mysterious power

B．were interested in Columbus’ trip

C．wanted to help Columbus

D．were clever

按计划免疫程序，下列哪项是错误的（）

A.出生接种卡介苗

B.1个月接种乙肝疫苗

C.3个月接种百白破混合制剂

D.6个月接种麻疹疫苗

E.4岁复种脊髓灰质炎疫苗