A.the sipmlest solution
B.the solution of simplest
C.the solution that simplification
D.which solution simplest
2)The poet MM spent several years ___ school in CP.
A.had taught
B.teaching
C.her teaching
D. and to teach
3)When the US C authorized a postal service in 1789, ___ 75 local offices.
A.the nation having
B.has the nation
C.the nation had
D.for the nation to have
4)___ places on the Earth where plant and animal life has not been affected by the activities of humans.
A.The few
B.Being few
C.There are fewb
D.Few
5)___ nerve pathways conect the eye directly to the pineal gland, that gland is extremely sensitive to light.
A.Because
B.That
C.How
D.By
6)Chrom……s vary in size and shape and usually ___ in pairs.
A.occurring
B.to occur
C.occur
D.as occur
7)SL became the first VS woman ___ abroad the RM space station. A.who working
B.has worked
C.was working
D.to work