Despite the hardship he encountered, Mark never gave up the pursuit of knowledge

A.a hardship

B.a joy

C.a reply

()means hardship ，a harsh circumstance.

A. sculpture

B. ingredient

C. rigor

D. procession

A.endured

B.tolerated

C.sustained

D.undertook

A. faced

B. faces

C. facing

D. to face

A.faces

B.facing

C.to face

D.foced

A.operated

B.attempted

C.managed

D.succeeded

此题为判断题(对，错)。

A dense

B severe

C plain

D intense

A.challenge

B.disaster

C.hardship

D.stage

The author writes of the development of geology to demonstrate _______.

A the process of specialisation and professionalisation

B the hardship of amateurs in scientific study

C the change of policies in scientific publications

D the discrimination of professionals against amateurs