600.We're looking forward to the holidays when we'll be travelling _____ camels ______ the Sahara Desert.

A.by;across

B.by;through

C.on;over

D.on;through

602.The weather in London is so changeable that people always take their umbrellas with them ____ rain.

A.for fear of

B.in need of

C.in spite of

D.because of

601.答案是D;

travel on the camel=travel by camel。注意:by+交通工具时，不加冠词且名词不用复数；through the Sahara Desert穿越撒哈拉大沙漠。

602.答案A;

for fear of 担心，唯恐。