在北半球背风而立,高气压在( )
A.后方
B.左后方
C.右后方
D.前方
答案:C
题目分析:
根据风压定律可知,北半球背风而立,高压在右后方,低压在左前方,C正确。
—What a mistake!
—Yes. I ______ he do it in another way, but without success.
A.was suggesting
B.have suggested
C.would suggest
D.had suggested
假如一个双链DNA分子中的鸟嘌呤占整个DNA分子碱基的比例为27%,并测得该DNA分子一条链上的腺嘌呤占这条链碱基的比例为28%,那么另一条链上的腺嘌呤占整个DNA分子碱基的比例是[ ]
A.9%
B.18%
C.23%
D.24%