国家助学贷款设立还款宽限期制度，即借款人申请后，自毕业起（）年内可不归还贷款本金及宽限期间产生的利息。
A.1
B.2
C.3
D.4
参考答案：B
根据句意及首字母提示补全单词。
1. China's flag has five yellow s_____ on it.
2. Beijing is in the n_____ of China.
3. Wang Fei is a very f_____ singer in China.
4. I want to v_____ Buckingham Palace some day.
5. I can't fly a kite (放风筝). It's not e_____, I think.
铆钉按照形状常分为（）管状空心和铭牌铆钉等。
A.平头铆钉
B.半圆头铆钉
C.沉头铆钉
D.半圆沉头铆钉
