What is the author's attitude toward DNA testing？
A. Negative.
B. Positive.
C. Suspicious.
D. Indifferent.
查看答案
Which of the following statements about graphene is true？
A. It is visible to the human eye．
B. It is possibly the thinnest material in the world．
C. It Can Be used to make paper．
D. Finding it Demands time and money．
A. discoverB. repairC. fixD. maintain
A. discover
B. repair
C. fix
D. maintain
请在第_____处填上正确答案。
A. borrowed
B. delivered
C. designed
D. gathered
请根据以下内容回答{TSE}题： The Old Gate In the Middle Ages the vast majority of European
A. grounds
B. reasons
C. causes
D. purposes
微信支付 
支付宝支付