Sign up for a free 1:1 live lesson at eCh ChineseLearning! Our science coordinator will contact you within one working day to arrange a free lesson. A 4. A 2. 2. A 2. 2. 2. 2. B 3. C 3. C 3. C 3. C 5. Enter the e-mail addresses of the actual recipients. Enter the e-mail addresses of the recipients. This article cannot be sent by e-mail.