将淀粉浆和淀粉酶的混合物放入半透膜袋中,扎好后浸入流动的温蒸馏水中,经过足够的时间后,取出袋内的液体,分别与①碘水 ②新制Cu(OH)2?加热 ③浓硝酸?微热?作用,其现象依次是
| A.显蓝色;无红色沉淀;显黄色 |
| B.不显蓝色;无红色沉淀;显黄色 |
| C.显蓝色;有红色沉淀;不显黄色 |
| D.不显蓝色;有红色沉淀;不显黄色 |
It’s high time you had your hair cut ; it’s getting _______ . 
| A.too much long | B.much too long ![]() |
C.long too much | D.too long much |
My friend showed me round the town, ______ was very kind of him. 
| A.which | B.that | C.where | D.it |
They use computers to keep the traffic _______ smoothly.
| A.being run | B.run | C.to run | D.running |
If you leave the club, you will not be_____back in .
| A.received | B.admitted | C.turned | D.moved |
What I need is_____ book that contains ______ABC of oil painting.
| A.a; 不填 | B.the; 不填 | C.the; an | D.a ; the |