单项选择题 According to Allen, why did the people do better with pets around when l~cing stressful tasks? A．They have lower blood pressure. B．They become more patient.C．They are less nervous. D．They are in higher spirits.

单项选择题 Where was the writer going?A. Johore Baru, B. The Causeway. C. Butterworth, D. Singapore.

单项选择题 49 A only B.then C.thus D still