【华慧考博】考博英语每日一练（5.25）考博加油！
1. The spontaneous movement of water across a membrane ______ gradient of water concentration is called osmosis.
A. drives a
B. driven by a
C. has driven
D. drove
2. Codes are a way of writing something in secret; ______, anyone who doesn’t know the code will not be able to read it.
A. that is
B. worse still
C. in short
D. on the other hand
【翻译-长难句翻译】
It applies equally to traditional historians who view history as only the external and internal criticism of sources and to social science historians who equate their activity with specific techniques.
