海洋中有丰富的食品、矿产、能源、药物和水产资源等(如下图所示)
下列有关说法正确的是( )
| A．大量的氰、磷废水排入海洋，易引发赤潮 |
| B．工段②中结晶出的MgCl2·6H2O可在空气中受热分解制无水MgCl2 |
| C．在工段③④⑤中溴元素均被氧化 |
| D．工段①中除去粗盐中的SO、Ca2＋、Mg2＋、Fe3＋等杂质，加入药品的顺序为： |
Na2CO3溶液→NaOH溶液→BaCl2溶液→过滤后加盐酸
It’s 2:00. The boys __________on the playground.
| A．run | B．running | C．are running | D．run |
--
--This afternoon.
| A．Where are you going? |
| B．What are you going to do? |
| C．When are you going? |
| D．What’s your name? |
Where are you going this afternoon?
| A．I’m going to buy some comic books. |
| B．I’m going to the bookstore. |
| C．Can I help you? |
| D．I’m going to visit my aunt. |
--Are you going to buybooks?
--Yes. I want to buy comic books.
| A．some, any | B．any, some | C．any, any | D．some, some |
I’m going to buy an English book.
| A．Do you have comic book? |
| B．What are you going to buy? |
| C．This afternoon. |
| D．I’m going to plant trees. |