Nhận biết (M1)

Danijel Jug and colleagues found that tilling—the practice of turning soil with hoes, plows, or other machines before planting crops—was associated with an increased yield of winter wheat. But some studies of other crops have found the opposite effect, for example __________

Which choice most effectively uses data from the table to complete the assertion?

• A.

  Min Huang and colleagues reported an even larger positive effect of no tilling on the yield of rice.

• B.

  Bharat Sharma Acharya and colleagues found a similar association in a study using soybeans.

• C.

  crop yields with tilling have ranged from 2,420 kilograms per hectare for maize to 4,860 kilograms per hectare for winter wheat.

• D.

  a study using winter wheat yielded 4,860 kilograms per hectare with tilling and only 3,910 kilograms per hectare without tilling.

Giải thích đáp án:

D

a study using winter wheat yielded 4,860 kilograms per hectare with tilling and only 3,910 kilograms per hectare without tilling.