单项选择题

Questions 19 to 21 are based on the conversation you have just heard. What is the man’s attitude toward the stem cell research

A．Supportive.
B．Opposed.
C．Pessimistic.
D．Neutral.
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单项选择题
A．The area is for passengers only.B．The man is asking the woman to leave.C．The man feels sorry for the woman.D．The woman is a member of the staff.
A．The area is for passengers only.
B．The man is asking the woman to leave.
C．The man feels sorry for the woman.
D．The woman is a member of the staff.
单项选择题
When did watches and clocks become common in the United States
A．From the 1850s.
B．From the 1700s.
C．From the 1800s.
D．From the 1900s.
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