Such legal entities provide the means for international cooperation and support of macroprojects related to the moon and mars that encourage global private sector participation.（）

单项选择题Education in Russia and the other new countries faces especially daunting obstacles because the struggling economies of these nations often provide insufficient funds for education.（）

A. stunning
B. discouraging
C. concerning
D. prevailing

单项选择题Dr White checked the patient’s signs carefully before making his statement.（）

A. synonyms
B. symptoms
C. symbols
D. suspensions