blastocyst formed at: A: 1-2 days B: 2-3 days C: 3-5 days D: 5-7days E: 7-9days

How long should children be quarantined at home after they have measles？ ( ) A: 10 days B: 7 days C: 5 days D: 15 days

She 1________ 5 -7 hours a day,and 2 _______ 6 days a week for many years.

It is generally necessary for a rice ear to emerge from the top of the ear to the base node of the ear A: A 5～7 days; B: B 2～4 days; C: C 8～10 days; D: D 10 days or more

The required compressive strength of PCC is measured at A: 3 days B: 7 days C: 14 days D: 28 days

How long is the Spring festival? A: 7 days B: 3 days

We can survive for seven days without food, but we can survive ____ days without water? A: 3 years B: 5 years C: 6 years D: 7 years

(single choice) How long should measles patients with no complications be isolated? A: 10 days after the onset of rash B: 14 days after the onset of rash C: 7 days after the onset of rash D: 5 days after the onset of rash E: Until rash is completely subsided

The contest takes the athletes 7 days to complete.同义句The athletes ___7 days to complete the contest.It ___the athletes 7days to complete the contest.

七天无理由退货7 Days （ ）