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刷刷题刷刷变学霸
举一反三
【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.
【单选题】Do you know something about tree rings Do you know they can tell us what the weather was like, sometimes even hundreds of years ago We can see the change of weather by studying the tree rings. For exa...
A.
It was good.
B.
It was bad.
C.
We don’t know.
【单选题】请根据下面短文回答第61～65题： Excuse me, Mrs. Jones. Would you mind doing me a favor I was just going out shopping. But as soon as I shut my front door, I realized that I had left my key in the house. So when I g...
A.
go to her husband
B.
drop in on Mrs. Jones
C.
get some salt
【单选题】City Traffic(交通) Company,P.O. Box 778Dear Sir, I am 20 years old. I have learned driving since I was 15. I got my driving license (执照) two years ago. My father is a driver. He taught me how to drive. ...
A.
1 year.
B.
5 years.
C.
20 years.
【单选题】请根据下面短文回答第66～70题： One day Jack’s wife was cleaning the house. "Look at all these umbrellas (雨伞) ," Jack’s wife said to him. "There are eight and they are broken." "I’ll take them all to the umbrella s...
A.
She was doing some washing.
B.
She was doing some cleaning.
C.
She was doing some shopping.
【单选题】请根据下面短文回答第66～70题： One day Jack’s wife was cleaning the house. "Look at all these umbrellas (雨伞) ," Jack’s wife said to him. "There are eight and they are broken." "I’ll take them all to the umbrella s...
A.
He wanted to buy a new umbrella.
B.
He asked the workers in the shop to mend the umbrellas.
C.
He wanted to return the umbrella to the woman.