题目
如图所示,过氧化氢在催化剂二氧化锰的作用下,迅速分解放出大量氧气。下列现象正确的是: A.气球胀大,红墨水左移 B.气球缩小,红墨水右移 C.气球胀大,红墨水右移 D.气球缩小,红墨水左移 答案:D连词成句。1. What, is, it, time, now__________________________________________2. I, love, on, going, trips__________________________________________3. at, leaves, the, 11: 50, train__________________________________________4. don't, please, down, sit__________________________________________