五四运动是中国近代史上重要的历史事件，它的历史意义有（    ）

细胞是生命系统最基本的结构层次，“每一个生物科学问题的答案都必须在细胞中寻找”．下列有关说法正确的是（　　）

根据算式30=5×6，我们就说____和____是____的因数。

找出左边句子的朋友，填序号

①Is she in the study?  ____                       A. Thanks.

②Is it in your hand?   ____                         B. It's in the kitchen.

③Is he in the kitchen?____                         C. I'd like some juice and bread.

④Are they on the table?____                      D. OK. Here you are.

⑤Dinner's ready.   ____                             E. No, they aren't.

⑥I'd like some vegetables, please. ____      F. Yes, it is.

⑦What would you like for dinner?____        G. No, he isn't.

⑧Where is the cat, Dad?  ____                    H. Yes, she is.