-- What a nice watch! How long you it?
-- For just two weeks.
A:will; buy
B:have; had
C:were; having
D:did; buy
某生物科技小组的同学将同时死去的10条小金鱼分成甲、乙两组;甲组的5条小金鱼灭菌后放在无菌的塑料袋内保存起来,乙组的5条小金鱼被深埋在一棵大树的根部,数十天后,发现乙组的5条小金鱼全腐烂了.请根据实验答问:
补全表格中所缺信息。
Cathy's problem
◎She feels sad because she has____every day.
ZhangMei's advice
◎Talk to others,such as parents,____or friends.
◎Listen to music because music can make people feel____.
◎____.It's a good way to forget about homework.
◎Try to____classmates.
用水蚤进行如图所示的实验,请分析回答:
“羊群效应”:羊群平时很散乱,但一旦头羊动起来,其他的羊也会不假思索地一哄而上,纷纷效仿,全然不顾前方是什么。“羊群效应”反映的主要是( )