Cows must eat grain, ________ they will not grow fat.A、orB、butC、whenD、though

To tie itself safely to a new home, a mussel must ______A．produce a thread to anchor to th

The transgenic farm animals mentioned in this passage are ______.A．pigs, cows and mosquito

A small percentage of the grain ______ruined by the prolonged rain.A. wasB. isC. wereD.

According to the Cereal Systems Initiative, the grain yields will increase______by each ye

You may look at a group of cows ____ under the trees.A: stoodB: standsC: standingD: to

____________, Miss Brown decided to take a taxi.A、She thought she must be lateB、Being th