Several scientists have been sent to that forest to ______ the wildlife there.
A. recognize
B. search
C. learn
D. study
_____
A. C++、LISP
B. C++、Smalltalk
C. Prolog、Ada
D. FoxPro、Ada
_____
A. 2i+j
B. 2i+j-1
C. 2i+j-2
D. 2i+j+1
My aunt ______ a restaurant in America.
A. works
B. operates
C. runs
D. organizes