[判断题]所有与行车有关的各部门，都应按列车调度员的要求组织本部门工作，确保列车按运行图行车。（）

There’s a human liver sitting in a lab dish in Madison, Wis. Also a heart, a brain and every bone in the human body even though the contents of the dish are a few cells too small to be seen without a microscope. But these are stem cells, the most immature human cells ever discovered, taken from embryos before they had decided upon their career path in the body. (46) If scientists could only figure out how to give them just the right kick in just the right direction, each could become a liver, a heart, a brain or a bone. (47) When a team from the University of Wisconsin announced their discovery, doctors around the world looked forward to a new era of medicine one without organ-donor shortages or the tissues-rejection problems that bedevil transplant patients today.
Doctors also saw obstacles, though. One of them was a U. S. Congress skittish about research on stem cells taken from unwanted human embryos and aborted fetuses. Indeed, 70 lawmakers asked i

American architecture is  (1)  its best when it is concerned with  (2)  that have a practical purpose. Factories, office buildings, public buildings, rail terminal and airports, and other such  (3)   show American architecture at its  (4)  imaginative and graceful, as well as its most  (5)  . The single most important American  (6)  design is the skyscraper, a style  (7)  in the late nineteenth century and since  (8)  as the trademark of American building.  (9)  the development of the steel skeleton and brick for buildings, the weight and low strength of stone and brick limited the  (10)  of the city office buildings  (11)  about twelve floors.  (12)  American cities grew larger in closing years of the 19th century, the  (13)  on which the structures might be placed because more valuable, the  (14)  for taller buildings increased. The us
A. knowing
B. know
C. knew
D. known