图中的四条折线所表示的纬度与数码相对应的一组正确的是 ① 23°26′N ② 赤道 ③ 20°S ④ 66°34′S
People go out with masks,________.
The dead rate is _____ pigs and recovery usually ______ within 7-10 days. A low in; occursB.rich in;happens C.high in; came aboutD.poor in;took place
_____ three influenza type A virus subtypes(子类型) have been found in pigs.
_____, experts point out that students can easily fail at starting their business because of a lack of preparations.
It has always been the _____ of our goverment to encourage graduates to start their business.