1344,840,455,49,()。
A.357
B.19
C.31
D.166
参考答案:A
解析:
数列中的各项均为7的倍数,而选项中可以被7整除的只有A项,故本题答案为A。
Our country, together with others in the Third World,________ hard to build a harmonious homeland
for human beings now.[ ]
A. work
B. working
C. is working
D. are working
根据传染病法的规定,不属于乙类传染病的是()。
A.艾滋病
B.脊髓灰质炎
C.麻疹
D.梅毒
E.霍乱