Because of such factors, engineers have worked on increasing the efficiency of elevators, resorting to double-decker cars to service and to transfer systems that ______ express and local elevators.

单选题

__________ for such a dangerous journey, many people died because of hunger and cold.

答案解析

单选题

Unwanted change of the original condition of a material because of chemical or physical vagents or a material that causes such a change.

答案解析

单选题

However,marriages between members of different groups（interclass,interfaith,and interracial marriages）are increasing,probably because of the greater（ ）of today’s youth and the fact that they are restricted by fewer prejudices than their parents.

答案解析

单选题

Because of such factors, engineers have worked on increasing the efficiency of elevators, resorting to double-decker cars to service and to transfer systems that ______ express and local elevators.

答案解析

单选题

Because of this, it was _____slowing down.

答案解析