下列各项,可以作为大陆漂移说证据的是( )
①世界一些地方的大陆轮廓的凹凸十分吻合
②非洲和南美洲生活着同种海牛和鸵鸟
③淮北南湖塌陷区原是一片陆地
④地球上七分海洋三分陆地.
A:③④
B:①③
C:②④
D:①②
Could you please____ ____the window?
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.
春季,河流流量显著增大的现象称为春汛,河流出现春汛的原因是多样的.读“哈尔滨气候资料表”(此数据亦可代表我国东北地区整体气候特征)和“松花江哈尔滨水文站流量年变化曲线图”,图中显示松花江出现了明显的春汛,其原因最可能是( )
月份
1
2
3
4
5
6
7
8
9
10
11
12
气温(℃)
﹣17
﹣11.6
﹣2
5.9
14
17.7
20.2
20.5
15.5
6.6
﹣5.4
﹣14.5
降水(mm)
3.8
5.5
7.4
29
49.6
84.4
104.3
134.4
56.7
22.7
13.8
5.7
已知点P是圆C:x2+y2=16上一动点,线段PQ垂直于x轴于Q点,点M为线段PQ的中点,则点M的轨迹方程为____