①一个基因决定一种性状
②一个基因影响多种性状
③多个基因决定一种性状
④环境对性状有影响
A:①②
B:①③④
C:①④
D:①②③④
My brother usually _____ in a townhouse with us. But now he _____ for an apartment near the school.
选字填空
辛 幸
扎风筝很____苦,但能给朋友带去快乐,我很____福。
读1月份海平面等压线图,回答下题.