5+6=____
12-8=____
8+3=____
15-8=____
2+9=____
12-6=____
8+5=____
15-9=____
9+9=____
11-8=____
下列词语中,没有错别字的一组是( )
Beethoven is a very____ (著名的)musician .I'm____ (紧张的)out because I can't find the way home.My mother often____ (担心)about my father's health..She likes to s____ e-mails at school.Lily is very t____ , she'd like to have some water.
下列物质所选用的材料中,属于有机合成材料的是( )