依次填入下列各句中横线处的词，最恰当的一组是（ ）
①菜籽油含有亚油酸、亚麻酸、花生酸等三种人体________的脂肪酸，还有油酸。
②春节后，争抢农民工——中国劳动力市场这一场没有硝烟的战争，已然从珠三角、长三角局部地区______到包括中、西部在内的全中国。
③葬礼没了众多与此无关的热闹，老人的身后却多了一份______ ，老人本来就是寂寞的。
A：必须 漫延 清净
B：必需 蔓延 清净
C：必需 漫延 清静
D：必须 蔓延 清静
①同学之情 ②朋友之情
③师生之情 ④亲子之情
A. is going shopping B. are going to play soccer C. is going to drive D. is going to watch TV E. am going to visit
Tomorrow is Sunday. I ____ my grandparents. My mother ____in the supermarket. My father ____ his car to his friend, Mr. Black. My sister ____ at home. My two brothers ____ with their classmates.
3.5×0.2=
1÷0.5=
4×0.25=
0.63÷0.7=
0.99÷0.01=
1.2×4=
2b﹣0.2b=
2.33×1.2=
撒哈拉以南的非洲地区经济特征是（ ）
