1、【题目】When making modern cameras , people began to_______ plastics for metal.

选项：

A.surround

B.substance

C.stretch

D.substitute

答案：

D

解析：

暂无解析

1、【题目】Pinetreesareusuallybelievedto_______coldweather.

选项：

A.guard

B.accomplish

C.roar

D.endure

答案：

解析：

1、【题目】Carelessness made him fall in his job _______.

选项：

A.interview

B.intention

C.stomach

D.stocking

答案：

A

解析：

暂无解析

1、【题目】ThecollegestudentsinChinaare_______fromsmokingoncampusbecausethiswilldothemnogood.

选项：

A.discouraged

B.observed

C.obeyed

D.obtained

答案：

解析：

1、【题目】The_______workcontinuedformorethanaweekbuttherewasstillnosignofthemissingboy.

选项：

A.research

B.rescue

C.vessel

D.vast

答案：

解析：