—It's difficult to get to the other side of the river. —I think a bridge ________ over the river. A. should be built B. should build C. will build D. has built
下面各组词语，没有错别字的一组是 A．偶尔 劝戒 稗官野史 出奇制胜 B．坍塌 机杼 嘎然而止 贻人口实 C．翔实 缄默
西双版纳有“热带动物王国”之称，这里有亚洲象、绿孔雀、长尾猿、长嘴犀鸟等国家重点保护动物。这里动物繁多的原因是（ ） A.水源充足 B.
______since he left his hometown.A．Ten years went byB．Ten years has passedC．It is ten years agoD．There are ten years
Great changes ____ in my hometown during the last three years. A have been taken place B was happened C have taken place D have happened
化肥厂生产合成氨的原料是煤、空气、水。生产简要流程如下： 煤气发生炉中主要反应：①C + O2 = CO2；②C + H2O = CO + H2。两个反应必须进行调控才能
(D)
=
=
.