31,37,41,43,( ),53。
A.51 B.45 C.49 D.47
参考答案:D
解析: 质数数列。
For a long time they walked without saying ______ word. Jim was the first to break ______ silence.
A.the; a
B.a; the
C.a; 不填
D.the; 不填
通常粗粒土表现出来的工程性质有()
A.压缩性低
B.强度较高
C.渗透性大
D.粘聚力高
E.以上全错