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【简答题】
Children are always happy. They can play________. A. for their heart’s content B. for their heart content C. to their heart’s content D. to their hearts’ content
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皮皮学刷刷变学霸
举一反三
【简答题】炭疽病人传染的途径是()。
【简答题】精氨酸的pK1(COOH)值为2.17,pK2值为9.04,pK3值为12.98,其pI(等电点时的pH值)为_________。天冬氨酸的pK1(COOH)值为1.88,pK2(COOH)值为3.65,pK3值为9.60,其pI值为_________。
【单选题】What does 'it' refer to in the last sentence of the fourth paragraph?
A.
The waiting list to participate in the study.
B.
The pilot study.
C.
The desperate people.
D.
The anti-smoking rinse.
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