應該使用look.
此題涉及主謂一致的問題,有兩點原則：
1.并列結(jié)構(gòu)作主語時謂語用復數(shù)
例：Reading and writing are very important.
2.當主語由and連結(jié)時,如果它表示一個單一的概念,即指同一人或同一物時,謂語動詞用單數(shù),and 此時連接的兩個詞前只有一個冠詞.
例：The iron and steel industry is very important to our life.