Many countries have conservation programs to prevent certain________

单选题 Many countries have conservation programs to prevent certain__________0f fish from　becoming extinct．

A．Species
B．Sources
C．numbers
D．members

参考答案A

解析: prevent certain__________0ffish from becoming extinct，阻止鱼儿灭亡。应该填入的是“种类”而非“资源”、“数量”。答案是A。

单选题 Susan never took any cookery courses．she learned cooking by__________useful tips from TV cookery programs．

A．picking up
B．bringing up
C．putting up
D．pulling up

单选题 The President__________his deputy to act for him while he was abroad．

A．Promoted
B．substituted
C．authorized
D．displaced

单选题 My oldest son had just finished an__________holiday stay prior to moving to a new state，a new job and the next chapter in his life．

A．Enlarged
B．Expanded
C．extended
D．increased