A:swim
B:to swim
C:swimming
D:to swimming
You are old enough . You shouldn't let your parents do everything ____ you
一氧化氮(NO)、二氧化氮(NO2)、五氧化二氮(N2O5),它们都属于____(填“单质”或“化合物”),它们的相同点是 ____.
Everyone ________ go through the security check(安检)when entering the World Expo Park.
年份
英国
日本
其他国家
1894
69.49
6.26
24.25
1900
62.99
11.20
25.81
1905
55.71
14.04
30.25
1910
50.89
16.14
32.97
1914
48.31
20.39
31.30