It is also very difficult to make transportation construction on the surface of the country due to its harsh long winter and its mountainous terrain. It's is amazing for this country to to set up a transcontinental railroad since last century. Until 1990, the route length was more than 86,880 kilometers. Most of the country's freight are transported by Canadian National and Canadian Pacific.The passage is mainly about ______.

It is also very difficult to make transportation construction on the surface of

[单选题]It seems very difficult ________ .A.to stop the child to cry B.restraining

I would have to make friends（     ）them and perhaps also compete（         ）them

__, this book is not very difficult.A. Generally sayB. Generally sayingC. Genera

“It was a very ______ situation which was difficult to ______.”A. interesting; c

_ I find the problems very difficult, I dont think they cant be solved.A. Althou

Researchers find it difficult to know how unsafe passwords are due to_______.A.

As the main road was blocked due to construction, the driver had to find an ___

[单选题]It is very difficult to keep the trains( )on time in winter.A.runB.runsC.ru

[单选题]A． very B also C seldom D not