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【单选题】

Every Saturday, Mr. Brown went (Example: (0) ) the market to buy food and other things. He put (41) in a big basket. He was old and weak, so he always (42) a man to carry the basket home for him. But one Saturday, while he (43) home in front of the man with (44) , the man ran away (45) it. The next week, when Mr. Brown went to the market again , a friend of his said , "Look, (46) ! That man took away your food last week ! " Mr. Brown at once ran behind a shop, and stayed there (47) the man left the market. His friend was very (48) , "Why did you do that. he asked. "Well, "said Mr. Brown, "that man was carrying my basket when he left me a week ago. He will want me to pay him for (49) , and that (50) me more than a basket full of food.\

A.
walked
B.
was walking
C.
left
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【单选题】Scientists have for the first time used cloning to create human embryos that live long enough in a laboratory dish to have their stem cells harvested. The feat could set the stage for physicians to pr...

A.
make DNAs that are very small and have immune systems.
B.
make DNAs that are as strong as antibiotics and vaccines.
C.
make DNAs that are identical with those in the patients’ cells.
D.
make DNAs that are consistent with the ACT research results.